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.

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

[EX Q]: Where can a description of us citizens civil liberties be found?
[EX A]: United States Bill of Rights

[EX Q]: What kind of stone is the rosetta stone?
[EX A]:
granodiorite