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

[EX Q]: Chris Martin is the lead vocalist and rhythm guitarist with which group?
[EX A]: chris martin

[EX Q]: Who wrote the novels About A Boy, How To Be Good and High Fidelity?
[EX A]: how to be good

[EX Q]: Who wrote the song `All Along The Watchtower`, which was a hit for Jimi Hendrix?
[EX A]:
all along the watchtower