This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Bhopal gas tragedy was caused by? \nSelect and explain. \nA. MIC, B. Sulphur dioxide, C. Hydrocarbons, D. CFC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bhopal gas tragedy in India is a sudden disaster occurred on 3rd December 1984, in which leakage in the storage tank of union carbide pesticide plant released tons of methyl isocyanate into the air. About 2 million people were exposed to gas leaving about 3000 dead . people are still suffering from the adverse effects of the gas.', 'role': 'assistant'}]