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: Which element begins the fourth group of the periodic table?

Answer: Titanium


Question: When did arches national park become a national park?

Answer: November 12, 1971


Question: How old do you need to be to play in the senior open?

Answer:
50 years