In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
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Question: Where is the real mona lisa painting kept?

Answer: The Louvre Museum, Paris


Question: When did leningrad changed back to st petersburg?

Answer: 6 September 1991


Question: British crown assumed sovereignty over india in year?

Answer:
1858