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: What is the new link that joins the atlantic and pacific?
Example Output: Panama Canal

Example Input: What ocean zone does the frilled shark live in?
Example Output:
outer continental shelf and upper continental slope