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

[Q]: Come Clean was the debut album by which 2000s band?
[A]: come clean


[Q]: Which biologist was known as Darwin's Bulldog?
[A]: charles darwin


[Q]: Which 'Doctor' has been played on television by Bill Simpson and David Rintoul?
[A]:
david rintoul