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: Who was the prime minister of assam when the burmese army came with badanchandra?

Answer: Badan Chandra Borphukan


Question: When did royal mail and post office split?

Answer: 1 April 2012


Question: Where does the earth's magnetic field originate?

Answer:
Earth's core