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]: Who won the civil wars of the warring states period in order to become the first emperor of china?
[A]: The first Sovereign Emperor of Qin"


[Q]: Who is the movie phantom thread based on?
[A]: Charles Wilson Brega James


[Q]: What is the name of the source of alpha radiation in a smoke alarm?
[A]:
americium-241