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

[Q]: Which former 'Eastenders' actor and Labour activist was elected to be one of the West Midlands representatives in the European parliamentary elections of 1999?
[A]: eastenders


[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]: Who was the Commander of the Union Army at the Battle of Gettysburg?
[A]:
union army