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: Who was the presiding officer at the constitutional convention?
Example Output: George Washington

Example Input: What does the rosenberg self esteem scale measure?
Example Output: self-esteem

Example Input: Who did the voice of hal in 2001 space odyssey?
Example Output:
Douglas Rain