This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hospital waste and disaster management, Occupational health, Subject name: Social & Preventive Medicine
[{'content': 'The size of Respirable dust is - \nSelect and explain. \nA. 1-5 microns, B. 5-10 microns, C. 15 microns, D. 20 microns', 'role': 'user'}, {'content': "Answer: A \nExplanation: - dust paicles smaller than 5 microns are directly inhaled into the lungs and are retained there. This fraction of dust is called respirable dust. - it is mainly responsible for pneumoconiosis. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:805 <\\p>", 'role': 'assistant'}]