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.

Example Input: In 550 bc which leader began the persian empire?
Example Output: Cyrus II of Persia

Example Input: Actor who plays john bates in downton abbey?
Example Output: Brendan Coyle

Example Input: Who sings in my way by calvin harris?
Example Output:
Calvin Harris