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

[EX Q]: Which of the American Idol judges has been there for all 10 seasons?
[EX A]: american idol

[EX Q]: Which Union leader of the American Civil War gave his name to a tree in California's 'Sequoia National Park'?
[EX A]: american civil war

[EX Q]: Who wrote the 1980 Booker Prize winner Rites of Passage!?
[EX A]:
to the ends of the earth