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 sprinter lit the Olympic flame at the 2000 Summer Olympic Games in Australia?

Answer: 2000 summer olympics

Question: Who is the current Australian prime minister ?

Answer: australia

Question: Which famous person in history did Mel Gibson play in the film 'Braveheart'?

Answer:
braveheart