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

[EX Q]: Physics. What is the SI unit for amount of substance?
[EX A]: amount of substance

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

[EX Q]: Who played Bert the chimney sweep in the film 'Mary Poppins'?
[EX A]:
mary poppins