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': 'Silicosis caused by ? \nSelect and explain. \nA. Gold, B. Coal, C. CO, D. Silica', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Silica", 'role': 'assistant'}]