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

[Q]: Which US state was the title of a no. 1 hit for the Bee Gees in 1967?
[A]: bee gees


[Q]: Which composer was married to Clara Wieck from 1840 until his death in 1856?
[A]: clara schumann


[Q]: Which city is also known as 'The Big Apple'?
[A]:
big apple