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

Ex Input:
Where is the Barbary Coast?

Ex Output:
barbary coast


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

Ex Output:
bon jovi


Ex Input:
Who succeeded Jon Pertwee as Dr Who?

Ex Output:

dr. who