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 war did the Sack of Badajoz takeplace?

Answer: siege of badajoz


Question: Grace Anna Goodhue was the wife of which US President?

Answer: grace coolidge


Question: In 1996, Dolly the Sheep was successfully cloned in which European country?

Answer:
dolly