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': 'Byssinosis is caused due to inhalation of: \nSelect and explain. \nA. Cotton fibre dust, B. Coal dust, C. Silica dust, D. Asbestos', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Byssinosis is caused due to inhalation of cotton fibre dust over long periods of time. It leads to pneumoconiosis causing chronic lung disease. Ref: Park 21st edition, page 747. Chapter: Occupational health.', 'role': 'assistant'}]