GENERAL KNOWLEDGE

Detailed explanation-1: -Four months after the San Francisco Conference ended, the United Nations officially began, on 24 October 1945, when it came into existence after its Charter had been ratified by China, France, the Soviet Union, the United Kingdom, the United States and by a majority of other signatories.

Detailed explanation-2: -Delegates of fifty nations met in San Francisco, California, USA, between 25 April and 26 June 1945 at the United Nations Conference on International Organization.