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 engineer built the Menai Suspension Bridge and the Caledonian Canal?

Answer: menai suspension bridge


Question: Which band had a hit with the song 'Brown Girl in the Ring'?

Answer: brown girl in the ring


Question: What is the capital city of Chechnya?

Answer:
chechnya