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.

Input: Consider Input: When did leningrad changed back to st petersburg?

Output: 6 September 1991


Input: Consider Input: What are the 4 majors on the pga tour?

Output: Masters Tournament, U.S. Open, The Open Championship, PGA Championship


Input: Consider Input: Is mauna loa the tallest mountain in the world?


Output: No