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

[EX Q]: What horse won the 2009 Grand National?
[EX A]: 2009 grand national

[EX Q]: Who was Domenikos Theotocopoulos better known as?
[EX A]: museum of el greco

[EX Q]: Who played Doctor Who in just 31 episodes between 1984 and 1986?
[EX A]:
doctor who