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: When did the us detonate the first hydrogen bomb?
Example Output: November 1, 1952

Example Input: When did united last win the champions league?
Example Output: 21 May 2008

Example Input: Which river has the largest basin in world?
Example Output:
Amazon River