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': 'Maximum permissible noise level in hospital wards is: March 2012 \nSelect and explain. \nA. 20-35 dBA, B. 35-40 dBA, C. 40-45 dBA, D. 50-60 dBA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: A i.e. 20-35 dBA Acceptable noise levels Acceptable noise level in hospitals (wards) is 20-35 dBA Acceptable noise level in library is 35-40 dBA \\\\ Acceptable noise level in conference is 40-45 dBA Acceptable noise level in restaurants and workshop is 40-60 dBA', 'role': 'assistant'}]