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

Q: Richard Block and David Quayle founded which British-based DIY retailing company in 1969?

A: david quayle
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Q: Which popular Doctor Who villains, it was revealed in 2011, are to be given 'a rest' by scriptwriters?

A: doctor who
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Q: Which US president was shot five days after the end of the American Civil War?

A:
american civil war
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