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: And Then There Were None?

Answer: and then there were none

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

Answer: doctor who

Question: What is the extramarital dating website whose subscription list was hacked in July 2015?

Answer:
online dating service