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:
Alphabetically, which is the last state in Australia?

Ex Output:
australia

Ex Input:
What long running comic strip character, created by Chester Gould, is described as a hard-hitting, fast-shooting and intelligent police detective with a love of trench coats and fedoras?

Ex Output:
chester gould