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

[EX Q]: What is the country of origin of the cheese called caerphilly?
[EX A]: caerphilly cheese

[EX Q]: Who played boxer James Braddock in the 2005 biopic Cinderella Man?
[EX A]: james j. braddock

[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