Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

[EX Q]: In which opera does a hunchback jester help his master, the Duke of Mantua, to seduce the daughter of a courtier?
[EX A]: duke of mantua

[EX Q]: I which European city will you find 'Dam Square'?
[EX A]: dam square

[EX Q]: William Randolph Hearst, Turk Murphy, Wyatt Earp and Joe DiMaggio are buried in cemeteries at Colma, where the dead outnumber the living by thousands to one. Where is Colma?
[EX A]:
colma, california