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

[EX Q]: Who is the BBC's political editor?
[EX A]: bbc

[EX Q]: Which Dickens novel is subtitled The Parish Boy's Progress?
[EX A]: charles dickens

[EX Q]: Cassandra, Grizabella and Skimbleshanks are all characters in which Andrew Lloyd Webber musical?
[EX A]:
andrew lloyd webber

