Problem: Tucson, Arizona:

Tucson's Sun Tran bus system serves greater Tucson with standard, express, regional shuttle, and on-demand shuttle bus service. It was awarded Best Transit System in 1988 and 2005. A 3.9-mile streetcar line, Sun Link, connects the University of Arizona campus with 4th Avenue, downtown, and the Mercado District west of Interstate 10 and the Santa Cruz River. Ten-minute headway passenger service began July 25, 2014. The streetcar utilizes Sun Tran's card payment and transfer system, connecting with the University of Arizona's CatTran shuttles, Amtrak, and Greyhound intercity bus service.

What kind of vehicles operate on the Sun Link?
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A: streetcar


Problem: The Protocol on Environmental Protection to the Antarctic Treaty (also known as the Environmental Protocol or Madrid Protocol) came into force in 1998, and is the main instrument concerned with conservation and management of biodiversity in Antarctica. The Antarctic Treaty Consultative Meeting is advised on environmental and conservation issues in Antarctica by the Committee for Environmental Protection. A major concern within this committee is the risk to Antarctica from unintentional introduction of non-native species from outside the region.
What group advises the Antarctic Treaty Consultative Meeting?
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Answer: Committee for Environmental Protection


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In 1999, ILO helped lead the Worst Forms Convention 182 (C182), which has so far been signed upon and domestically ratified by 151 countries including the United States. This international law prohibits worst forms of child labour, defined as all forms of slavery and slavery-like practices, such as child trafficking, debt bondage, and forced labour, including forced recruitment of children into armed conflict. The law also prohibits the use of a child for prostitution or the production of pornography, child labour in illicit activities such as drug production and trafficking; and in hazardous work. Both the Worst Forms Convention (C182) and the Minimum Age Convention (C138) are examples of international labour standards implemented through the ILO that deal with child labour.
What other international laws deal with child labour?
A: Minimum Age Convention (C138)


Context and question: Charlemagne's expansion of the Frankish empire around 800, including northern Italy and Rome, brought on a brief period of stability and unity in Francia. This created opportunities for Jewish merchants to settle again north of the Alps. Charlemagne granted the Jews freedoms similar to those once enjoyed under the Roman Empire. In addition, Jews from southern Italy, fleeing religious persecution, began to move into central Europe.[citation needed] Returning to Frankish lands, many Jewish merchants took up occupations in finance and commerce, including money lending, or usury. (Church legislation banned Christians from lending money in exchange for interest.) From Charlemagne's time to the present, Jewish life in northern Europe is well documented. By the 11th century, when Rashi of Troyes wrote his commentaries, Jews in what came to be known as "Ashkenaz" were known for their halakhic learning, and Talmudic studies. They were criticized by Sephardim and other Jewish scholars in Islamic lands for their lack of expertise in Jewish jurisprudence (dinim) and general ignorance of Hebrew linguistics and literature. Yiddish emerged as a result of language contact with various High German vernaculars in the medieval period. It was written with Hebrew letters, and heavily influenced by Hebrew and Aramaic.
Charlemagne's expansion of the Frankish empire created opportunities for Jewish merchants to settle where?
Answer: north of the Alps


Question: Arsenal finished in either first or second place in the league in eight of Wenger's first eleven seasons at the club, although on no occasion were they able to retain the title. As of July 2013, they were one of only five teams, the others being Manchester United, Blackburn Rovers, Chelsea, and Manchester City, to have won the Premier League since its formation in 1992. Arsenal had never progressed beyond the quarter-finals of the Champions League until 2005–06; in that season they became the first club from London in the competition's fifty-year history to reach the final, in which they were beaten 2–1 by Barcelona. In July 2006, they moved into the Emirates Stadium, after 93 years at Highbury.
Is there an answer to this question: Manchester United plays in what stadium?

Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In the early 1970s the Rolling Stones developed their hard rock sound with Exile on Main St. (1972). Initially receiving mixed reviews, according to critic Steve Erlewine it is now "generally regarded as the Rolling Stones' finest album". They continued to pursue the riff-heavy sound on albums including It's Only Rock 'n' Roll (1974) and Black and Blue (1976). Led Zeppelin began to mix elements of world and folk music into their hard rock from Led Zeppelin III (1970) and Led Zeppelin IV (1971). The latter included the track "Stairway to Heaven", which would become the most played song in the history of album-oriented radio. Deep Purple continued to define hard rock, particularly with their album Machine Head (1972), which included the tracks "Highway Star" and "Smoke on the Water". In 1975 guitarist Ritchie Blackmore left, going on to form Rainbow and after the break-up of the band the next year, vocalist David Coverdale formed Whitesnake. 1970 saw The Who release Live at Leeds, often seen as the archetypal hard rock live album, and the following year they released their highly acclaimed album Who's Next, which mixed heavy rock with extensive use of synthesizers. Subsequent albums, including Quadrophenia (1973), built on this sound before Who Are You (1978), their last album before the death of pioneering rock drummer Keith Moon later that year.
What two hard rock songs are featured on Deep Purple's Machine Head album?
A:
"Highway Star" and "Smoke on the Water"