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': 'ESI act was made in: September 2004 \nSelect and explain. \nA. 1946, B. 1948, C. 1952, D. 1954', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. 1948', 'role': 'assistant'}]