This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'The world health organisation day is – \nSelect and explain. \nA. 7th April, B. 21st May, C. 2nd August, D. 31st December', 'role': 'user'}, {'content': 'Answer: A \nExplanation: World health organization (WHO) \n\nThe WHO is a specialized non-political health agency with headquarter at Geneva.\nIn 1946, the constitution was drafted by the "Technical preparatory committee “under the chairmanship of Rene sand and was approved in the same year by an international health conference of 51 nations in New York.\nThe constitution came into force on 7th April 1948, which is celebrated every year as world health day.', 'role': 'assistant'}]