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': 'WHO constitution was made in – \nSelect and explain. \nA. 1947, B. 1950, C. 1952, D. 1956', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Constitution was drafted\xa0→ 1946\nConstitution come into force\xa0→ 1948', 'role': 'assistant'}]