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

[EX Q]: What name is given to the Fourth (4th) movement in Beethoven's / Ninth (9th) Symphony?
[EX A]: ludwig van beethoven

[EX Q]: Which group of the 1970's featured Tony Iommi on guitar, Geezer Butler on bass and Bill Ward on drums?
[EX A]: geezer butler

[EX Q]: Banting, Best and MacLeod are renowned for the discovery of what in 1922?
[EX A]:
frederick banting