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

Ex Input:
Which instrument was Benny Goodman famous for playing?

Ex Output:
benny goodman

Ex Input:
In book and film, which vessel was commanded by Charlie Allnut?

Ex Output:
charlie allnut

Ex Input:
Which US group of the 1970s consisted of Dewy Bunnell, Dan Peek and Gerry Beckley and had hits including Tin Man and Sister Golden Hair?

Ex Output:
dewey bunnell