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

[EX Q]: Chris Difford and Glenn Tilbrook founded which band in 1974?
[EX A]: chris difford

[EX Q]: In the British Army, what rank falls between Major General and Colonel?
[EX A]: british army

[EX Q]: The film The Curious Case of Benjamin Button, starring Brad Pitt, is based on a short story by whom?
[EX A]:
the curious case of benjamin button