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

[EX Q]: What nickname is given to the Australian Association Football International team?
[EX A]: australia

[EX Q]: Which horse won the 2008 Grand National?
[EX A]: 2008 grand national

[EX Q]: Nadgett, Elijah Pogram and Tom Pinch appear in which Dickens novel?
[EX A]:
charles dickens