This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Occupational Health, Subject name: Social & Preventive Medicine
Acceptable noise level (in decibels) for Hospital wards is: 
Select and explain. 
A. 20-35, B. 35-45, C. 45-55, D. 50-60
A: 20-35
Answer: A: 20-35 
Explanation: Ans (a) 20-35Ref : K. Park 23rd ed. / 741-42, 19th/599Acceptable noise levels (dBA)Residential:Bed roomLiving room2540Commercial:OfficeConferenceRestaurants35-4540-4540-60industrial:WorkshopLaboratory40-6040-50Educational:Class roomLibrary30-4035-40Hospitals:Wards20-35