In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Q: This reaction is combined with an aldol condensation to produce cyclohexenones in a process named for Robinson, and a variation of this uses silyl ethers and titanium tetrachloride, in a reaction named also for Mukaiyama. In a process analogous to this reaction, performed with simple ketones, the equilbrium is shifted towards the reagents, unlike in the Claisen and aldol condensations, necessitating the use of an enolate in conjugate addition to produce the 1,4-addition. For 10 points, what is this reaction named for an American chemist, which consists of the addition of a carbanion to an alpha, beta unsaturated carbonyl

A: Science
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Q: In one opera by this composer set in Stockholm, the fortune-teller Ulrica prophesizes that Riccardo will be killed by the next man who shakes his hand. This composer of A Masked Ball included "Va, pensiero," or the Chorus of the Hebrew Slaves, in an opera which details the exile of the Jews from Babylon, Nabucco. In addition to the drinking song "Libiamo ne' lieti calici" in an opera about Alfredo and Violetta, this composer wrote an opera which sees the Duke of Mantua sing "La donna e mobile" and another opera about an Egyptian princess. For 10 points, name this Italian composer of Rigoletto, La traviata, and Aida.

A: Fine Arts
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Q: Various legends descibe how the body of the losing commander slain at this battle was either displayed for two days at Leicester or merely pitched off a bridge into the River Soar, where it was later found and buried at the Greyfriars Monastery. Though the winning commander managed to gather forces numbering about five thousand during a march to Ambion Hill, he still faced an opponent more than three times as large. This battle saw the death of the Duke of Norfolk as well as the losing commander. Helped in no small part by the treachery of the brothers Sir William and Thomas Lord Stanley, FTP, name this battle of 1485 in which Richard III was slain and Henry Tudor was crowned, ending the Wars of the Roses.

A:
History
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