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: Who played the character Gene Hunt in the UK TV series 'Life on Mars' and 'Ashes to Ashes'?

Answer: life on mars

Question: And Then There Were None?

Answer: and then there were none

Question: Which Canadian city is the capital of Alberta state?

Answer:
alberta