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.

Q: Journal of optics a pure and applied optics abbreviation?

A: J. Opt.
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Q: Which is the new member of nato in 2017?

A: Montenegro
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Q: Where did tour de france start in 2017?

A:
Düsseldorf, Germany
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