This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health education & planning, Subject name: Social & Preventive Medicine
Acceptable noise level in hospital wards 
Select and explain. 
A. 20 - 35dB, B. 35 - 40 dB, C. 45-55dB, D. 50-60dB
A: 20 - 35dB
Answer: A: 20 - 35dB 
Explanation: Ref:Park's Textbook of Preventive and Social Medicine 25th Ed