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

[EX Q]: In which famous film did Michael Caine play a character named Charlie Croker?
[EX A]: charlie croker

[EX Q]: Albion is the oldest known name for which nation?
[EX A]: albion

[EX Q]: Which book by Mark Haddon was the Booker Prize winner in 2003?
[EX A]:
mark haddon