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

Ex Input:
What was Bon Jovi's first UK top ten hit single?

Ex Output:
bon jovi

Ex Input:
Which American city has baseball-playing 'Dodgers'?

Ex Output:
los angeles dodgers

Ex Input:
What Brooklyn landmark is named after the rabbits that over-ran it in the 17th century?

Ex Output:
brooklyn