TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What horse won the 2009 Grand National?

SOLUTION: 2009 grand national

PROBLEM: In which US state would you find the cities of Chesapeake, Roanoke and Fredericksburg?

SOLUTION: fredericksburg

PROBLEM: The uninhabited Bouvet Island in the South Atlantic is a dependency of what country?

SOLUTION:
bouvet island