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: In which opera does a hunchback jester help his master, the Duke of Mantua, to seduce the daughter of a courtier?

Answer: duke of mantua


Question: What is the second book of the Bible?

Answer: bible


Question: In which European country is the `Black Forest`?

Answer:
black forest