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

[EX Q]: Who has taken over the TV role of Doctor Who, from actor David Tennant?
[EX A]: doctor who

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

[EX Q]: Which architect designed Blenheim Palace and castle Howard?
[EX A]:
blenheim palace