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 do purple martins go for the winter?

Answer: Amazon River Basin


Question: When is prison break season 5 coming back?

Answer: April 4, 2017


Question: What season of grey's anatomy does denny die?

Answer:
Season 2 Episode 27