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

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


[Q]: What city was the capital of the Confederacy for most of the Civil War?
[A]: confederate states of america


[Q]: The towns of Wantage and Didcot are in which English county?
[A]:
didcot