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 Input:
In 550 bc which leader began the persian empire?

Ex Output:
Cyrus II of Persia


Ex Input:
Who does the voice of peach in finding nemo?

Ex Output:
Allison Janney


Ex Input:
What do the w and k stand for in call letters?

Ex Output:

Letters given to US merchant ships