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': 'Mental Health Act was passed in ? \nSelect and explain. \nA. 1982, B. 1987, C. 1971, D. 1950', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 1987", 'role': 'assistant'}]