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: Aragon and Castile joined to form which country?

Answer: aragon


Question: Ornette Coleman, Louis Armstrong and Charles Mingus are associated with what style of music?

Answer: charles mingus


Question: Who was kidnapped and assassinated by the left-wing movement 'Brigate Rosse' in 1978?

Answer:
red brigades