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 was the first Apollo mission to leave Earth orbit and orbit the moon, in 1968?

Answer: apollo


Question: Which Renaissance artist's life was fictionalised in the book 'The Agony and the Ecstasy' subsequently made into a film?

Answer: the agony and the ecstasy


Question: Which actor played the second Dr Who?

Answer:
doctor who