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]: Thereze Bazar and David van Day were better known as which duo?
[A]: david van day


[Q]: The Great Gate of Kiev and Catacombs are two sections of which musical work by Mussorgsky?
[A]:
catacombs