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

[EX Q]: Will you still be sending me a valentine is a line from which Beatles song?
[EX A]: the beatles

[EX Q]: Who directed the 2005 film 'Brokeback Mountain'?
[EX A]: brokeback mountain

[EX Q]: Who played the title role in the 2008 film 'The Curious Case Of Benjamin Button'?
[EX A]:
the curious case of benjamin button