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: The film The Curious Case of Benjamin Button, starring Brad Pitt, is based on a short story by whom?

Answer: the curious case of benjamin button


Question: Who was re-elected Prime Minister of Canada in May 2011?

Answer: prime minister of canada


Question: Which author's works feature 'Blandings Castle' and 'The Drones Club'?

Answer:
blandings castle