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 range of mountains are the two highest peaks Aconcagua and Ojos Del Salado?

Ex Output:
aconcagua


Ex Input:
What horse won the 2009 Grand National?

Ex Output:
2009 grand national


Ex Input:
For what role is actor Buster Crabbe best known?

Ex Output:

buster crabbe