Problem: Melbourne:

The city is home to many professional franchises/teams in national competitions including: cricket clubs Melbourne Stars, Melbourne Renegades and Victorian Bushrangers, which play in the Big Bash League and other domestic cricket competitions; soccer clubs Melbourne Victory and Melbourne City FC (known until June 2014 as Melbourne Heart), which play in the A-League competition, both teams play their home games at AAMI Park, with the Victory also playing home games at Etihad Stadium. Rugby league club Melbourne Storm which plays in the NRL competition; rugby union clubs Melbourne Rebels and Melbourne Rising, which play in the Super Rugby and National Rugby Championship competitions respectively; netball club Melbourne Vixens, which plays in the trans-Tasman trophy ANZ Championship; basketball club Melbourne United, which plays in the NBL competition; Bulleen Boomers and Dandenong Rangers, which play in the WNBL; ice hockey teams Melbourne Ice and Melbourne Mustangs, who play in the Australian Ice Hockey League; and baseball club Melbourne Aces, which plays in the Australian Baseball League. Rowing is also a large part of Melbourne's sporting identity, with a number of clubs located on the Yarra River, out of which many Australian Olympians trained. The city previously held the nation's premier long distance swimming event the annual Race to Prince's Bridge, in the Yarra River.

In which river was the annual Race to Prince's Bridge held?
---
A: Yarra


Problem: The Council does not have executive powers but meets biannually to discuss issues of mutual importance. Similarly, the Parliamentary Assembly has no legislative powers but investigates and collects witness evidence from the public on matters of mutual concern to its members. Reports on its findings are presented to the Governments of Ireland and the United Kingdom. During the February 2008 meeting of the British–Irish Council, it was agreed to set up a standing secretariat that would serve as a permanent 'civil service' for the Council. Leading on from developments in the British–Irish Council, the chair of the British–Irish Inter-Parliamentary Assembly, Niall Blaney, has suggested that the body should shadow the British–Irish Council's work.
The council has executive powers and meets how often?
---
Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The creation of modern-day Eritrea is a result of the incorporation of independent, distinct kingdoms and sultanates (for example, Medri Bahri and the Sultanate of Aussa) eventually resulting in the formation of Italian Eritrea. In 1947 Eritrea became part of a federation with Ethiopia, the Federation of Ethiopia and Eritrea. Subsequent annexation into Ethiopia led to the Eritrean War of Independence, ending with Eritrean independence following a referendum in April 1993. Hostilities between Eritrea and Ethiopia persisted, leading to the Eritrean–Ethiopian War of 1998–2000 and further skirmishes with both Djibouti and Ethiopia.
When did Eritrea join a federation with Ethiopia, the Federation of Ethipia and Eritrea?
A: 1947


Context and question: Mechanically scanned, 30-line television broadcasts by John Logie Baird began in 1929, using the BBC transmitter in London, and by 1930 a regular schedule of programmes was transmitted from the BBC antenna in Brookmans Park. Television production was switched from Baird's company to what is now known as BBC One on 2 August 1932, and continued until September 1935. Regularly scheduled electronically scanned television began from Alexandra Palace in London on 2 November 1936, to just a few hundred viewers in the immediate area. The first programme broadcast – and thus the first ever, on a dedicated TV channel – was "Opening of the BBC Television Service" at 15:00. The first major outside broadcast was the coronation of King George VI and Queen Elizabeth in May 1937. The service was reaching an estimated 25,000–40,000 homes before the outbreak of World War II which caused the service to be suspended in September 1939. The VHF broadcasts would have provided an ideal radio beacon for German bombers homing in on London, and the engineers and technicians of the service would be needed for the war effort, in particular the radar programme.
When was BBC One established? 
Answer: unanswerable


Question: After secretly crossing the Yalu River on 19 October, the PVA 13th Army Group launched the First Phase Offensive on 25 October, attacking the advancing UN forces near the Sino-Korean border. This military decision made solely by China changed the attitude of the Soviet Union. Twelve days after Chinese troops entered the war, Stalin allowed the Soviet Air Force to provide air cover, and supported more aid to China. After decimating the ROK II Corps at the Battle of Onjong, the first confrontation between Chinese and U.S. military occurred on 1 November 1950; deep in North Korea, thousands of soldiers from the PVA 39th Army encircled and attacked the U.S. 8th Cavalry Regiment with three-prong assaults—from the north, northwest, and west—and overran the defensive position flanks in the Battle of Unsan. The surprise assault resulted in the UN forces retreating back to the Ch'ongch'on River, while the Chinese unexpectedly disappeared into mountain hideouts following victory. It is unclear why the Chinese did not press the attack and follow up their victory.
Is there an answer to this question: When did the Chinese and US military have their first confrontation in Korea?

Answer: 1 November 1950


Question: As civil wars engulfed several Central American countries in the 1980s, hundreds of thousands of Salvadorans fled their country and came to the United States. Between 1980 and 1990, the Salvadoran immigrant population in the United States increased nearly fivefold from 94,000 to 465,000. The number of Salvadoran immigrants in the United States continued to grow in the 1990s and 2000s as a result of family reunification and new arrivals fleeing a series of natural disasters that hit El Salvador, including earthquakes and hurricanes. By 2008, there were about 1.1 million Salvadoran immigrants in the United States.
Is there an answer to this question: What was the population of El Salvador in 1990?

Answer:
unanswerable