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

[EX Q]: What is the SI unit of capacitance?
[EX A]: capacitance

[EX Q]: What hit song by the Crash Test Dummies comprised four three-letter words all containing the same letter?
[EX A]: crash test dummies

[EX Q]: A clavichord is what type of instrument?
[EX A]:
clavichord