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: Between 1958 and 1972 all Cliff Richard single records were released on which record label?

Answer: cliff richard


Question: Which major river has its source at the confluence of the rivers Brigach and Breg in the Black Forest?

Answer: breg


Question: In which Indian city is Eden Gardens, the second largest test cricket ground in the world?

Answer:
eden gardens