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]: In 550 bc which leader began the persian empire?
[EX A]: Cyrus II of Persia

[EX Q]: Who has most centuries in first class cricket?
[EX A]: Sir John Berry Hobbs

[EX Q]: When does scorpion season 4 episode 13 air?
[EX A]:
January 15, 2018