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': 'What is the acceptable noise level in Hospital (In decibel)? \nSelect and explain. \nA. 20-May, B. 20-35, C. 35-50, D. 70-85', 'role': 'user'}, {'content': "Answer: B \nExplanation: Acceptable noise levels (decibels) Residential Bed room 25 Living room 40 Educational Class room 30-40 Library 35-40 Hospital Wards 20-35 Industrial Workshop 40-60 Laboratory 40-50 Ref: Park's textbook of Preventive and Social Medicine, 21stedition, page-685.", 'role': 'assistant'}]