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

[EX Q]: Which Nation does Aston Villa Goalkeeper Brad Guzan represent?
[EX A]: brad guzan

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

[EX Q]: Which boxer had the nickname `The Dark Destroyer`?
[EX A]:
boxing