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 lead singer of acdc died?
Example Output: February 19, 1980

Example Input: Who coined the phrase war to end all wars?
Example Output: H. G. Wells

Example Input: When did the great wall became a world heritage site?
Example Output:
1987