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

Ex Input:
Denzil Washington played which black militant leader in the 1992 film of the same name?

Ex Output:
denzel washington

Ex Input:
Which boxer won a 1.8m claim against promotor Frank Warren in March 2009?

Ex Output:
boxing

Ex Input:
Who wrote the Jimi Hendrix hit 'All Along the Watchtower'?

Ex Output:
all along the watchtower