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: Which play and film was adapted from a story by Christopher Isherwood and later adapted as the musical and film Cabaret?

Answer: cabaret


Question: Who played 'Emma Peel' in the 1998 film 'The Avengers'?

Answer: the avengers


Question: In the novel 20,000 Leagues Under The Sea what was the name of the captain of the submarine Nautilus?

Answer:
twenty thousand leagues under the sea