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

Ex Input:
In which town in California is Disneyland?

Ex Output:
disneyland

Ex Input:
What American swimmer won eight gold medals at the 2008 Olympics?

Ex Output:
2008 summer olympics

Ex Input:
Double Dutch is a variation of what children's game?

Ex Output:
double dutch