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 horse won the 2009 Epsom Derby?

Answer: 2009 epsom derby


Question: In which US state are the Catskill Mountains?

Answer: catskill mountains


Question: The largest region in New Zealand is Canterbury. Which city is the seat of government?

Answer:
new zealand