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': 'Commonest occupational disease in developing countries is - \nSelect and explain. \nA. Pneumoconiosis, B. Asbemstosis, C. Lung cancer, D. Occupational poisoning', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans is `d' i.e., Occupational poisoning", 'role': 'assistant'}]