Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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Question: What is the name of the co-founder of Apple Computers who died in October 2011?

Answer: apple inc.

Question: 'Mrs Dalloway' and To the Lighthouse' are among the works of which writer?

Answer: to the lighthouse

Question: Which group of the 1970's featured Tony Iommi on guitar, Geezer Butler on bass and Bill Ward on drums?

Answer:
geezer butler