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.


[Q]: What is the si unit of time period?
[A]: second


[Q]: Who coined the term zymase for enzymes in yeast?
[A]:
Eduard Buchner