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

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


[Q]: What are Proxima Centauri, Sirius A, Pollux, Arcturus and Betelgeuse?
[A]: arcturus


[Q]: The Ivy League university Brown is in which US State capital?
[A]:
brown