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': '"Farmer\'s Lung" is due to inhalation of-(mmiE as) \nSelect and explain. \nA. Cotton fiber, B. Sugarcane fiber, C. Hay dust, D. Coal dust', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Flay dust", 'role': 'assistant'}]