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

[EX Q]: Who wrote the poem Elegy Written in a Country Churchyard?
[EX A]: elegy written in a country churchyard

[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]: Which American situation comedy created by David Crane and Marta Kauffman premiered on NBC on September 22, 1994?
[EX A]:
nbc