Problem: New York City:

Sociologists and criminologists have not reached consensus on the explanation for the dramatic decrease in the city's crime rate. Some attribute the phenomenon to new tactics used by the NYPD, including its use of CompStat and the broken windows theory. Others cite the end of the crack epidemic and demographic changes, including from immigration. Another theory is that widespread exposure to lead pollution from automobile exhaust, which can lower intelligence and increase aggression levels, incited the initial crime wave in the mid-20th century, most acutely affecting heavily trafficked cities like New York. A strong correlation was found demonstrating that violent crime rates in New York and other big cities began to fall after lead was removed from American gasoline in the 1970s. Another theory cited to explain New York City's falling homicide rate is the inverse correlation between the number of murders and the increasingly wetter climate in the city.

The decrease in crime in New York is sometimes attributed to the decline of what street drug?
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A: crack


Problem: Migration plays an important role in Thuringia. The internal migration shows a strong tendency from rural areas towards the big cities. From 2008 to 2012, there was a net migration from Thuringia to Erfurt of +6,700 persons (33 per 1000 inhabitants), +1,800 to Gera (19 per 1000), +1,400 to Jena (14 per 1000), +1,400 to Eisenach (33 per 1000) and +1,300 to Weimar (21 per 1000). Between Thuringia and the other German states, the balance is negative: In 2012, Thuringia lost 6,500 persons to other federal states, the most to Bavaria, Saxony, Hesse and Berlin. Only with Saxony-Anhalt and Brandenburg the balance is positive. The international migration is fluctuating heavily. In 2009, the balance was +700, in 2010 +1,800, in 2011 +2,700 and in 2012 +4,800. The most important countries of origin of the Thuringia migrants from 2008 to 2012 were Poland (+1,700), Romania (+1,200), Afghanistan (+1,100) and Serbia/Montenegro/Kosovo (+1,000), whereas the balance was negative with Switzerland (−2,800) and Austria (−900).
How many migrants bombed Eisenach?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
For two and a half centuries from the mid 13th, the politics in the Northern India was dominated by the Delhi Sultanate and in the Southern India by the Vijayanagar Empire which originated as a political heir of the erstwhile Hoysala Empire and Pandyan Empire. However, there were other regional powers present as well. In the North, the Rajputs were a dominant force in the Western and Central India. Their power reached to the zenith under Rana Sanga during whose time Rajput armies were constantly victorious against the Sultanate army. In the South, the Bahmani Sultanate was the chief rival of the Vijaynagara and gave Vijayanagara tough days many a times. In the early 16th century Krishnadevaraya of the Vijayanagara Empire defeated the last remnant of Bahmani Sultanate power after which the Bahmani Sultanate collapsed. It was established either by a Brahman convert or patronized by a Brahman and form that source it got the name Bahmani. In the early 16th century, it collapsed and got split into five small Deccan sultanates. In the East, the Gajapati Kingdom remained a strong regional power to reckon with, so was the Ahom Kingdom in the North-east for six centuries.
Gajapati Kingdom was powerful in the east for how many centuries?
A: six centuries


Context and question: Blues rock acts that pioneered the sound included Cream, The Jimi Hendrix Experience, and The Jeff Beck Group. Cream, in songs like "I Feel Free" (1966) combined blues rock with pop and psychedelia, particularly in the riffs and guitar solos of Eric Clapton. Jimi Hendrix produced a form of blues-influenced psychedelic rock, which combined elements of jazz, blues and rock and roll. From 1967 Jeff Beck brought lead guitar to new heights of technical virtuosity and moved blues rock in the direction of heavy rock with his band, The Jeff Beck Group. Dave Davies of The Kinks, Keith Richards of The Rolling Stones, Pete Townshend of The Who, Hendrix, Clapton and Beck all pioneered the use of new guitar effects like phasing, feedback and distortion. The Beatles began producing songs in the new hard rock style beginning with the White Album in 1968 and, with the track "Helter Skelter", attempted to create a greater level of noise than the Who. Stephen Thomas Erlewine of AllMusic has described the "proto-metal roar" of "Helter Skelter," while Ian MacDonald argued that "their attempts at emulating the heavy style were without exception embarrassing."
What artist avoided the use of distortion and pioneered new guitar effects?
Answer: unanswerable


Question: Newtown Creek, a 3.5-mile (6-kilometer) a long estuary that forms part of the border between the boroughs of Brooklyn and Queens, has been designated a Superfund site for environmental clean-up and remediation of the waterway's recreational and economic resources for many communities. One of the most heavily used bodies of water in the Port of New York and New Jersey, it had been one of the most contaminated industrial sites in the country, containing years of discarded toxins, an estimated 30 million US gallons (110,000 m3) of spilled oil, including the Greenpoint oil spill, raw sewage from New York City's sewer system, and other accumulation.
Is there an answer to this question: How many cubic meters of oil is supposed to be in Newtown Creek?

Answer: 110,000


Problem: Korean War:

The principal battles of the stalemate include the Battle of Bloody Ridge (18 August–15 September 1951), the Battle of the Punchbowl (31 August-21 September 1951), the Battle of Heartbreak Ridge (13 September–15 October 1951), the Battle of Old Baldy (26 June–4 August 1952), the Battle of White Horse (6–15 October 1952), the Battle of Triangle Hill (14 October–25 November 1952), the Battle of Hill Eerie (21 March–21 June 1952), the sieges of Outpost Harry (10–18 June 1953), the Battle of the Hook (28–29 May 1953), the Battle of Pork Chop Hill (23 March–16 July 1953), and the Battle of Kumsong (13–27 July 1953).

What was the shortest of the major battles fought during the stalemate?
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A:
the Battle of the Hook