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

Ex Input:
Which two brothers had hits with Cathy's Clown and Wake Up Little Susie?

Ex Output:
cathy's clown

Ex Input:
What breed of dog is Marmaduke in the newspaper cartoon strip of that name?

Ex Output:
dog

Ex Input:
Which band released the albums Sheer Heart Attack and A Day at the Races?

Ex Output:
a day at the races