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: When did the lead singer of acdc died?

Answer: February 19, 1980


Question: Where are sister chromatids attached to one another?

Answer: common centromere


Question: How does the lens of the eye change shape?

Answer:
Accommodation