This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
Acceptable noise levels in bed room 
Select and explain. 
A. 40dB, B. 35dB, C. 20dB, D. 25dB
D: 25dB
Answer: D: 25dB 
Explanation: Acceptable noise levels Expressed in dB (A), sound pressure levels conforming to weighting curve (A) Environment Place Acceptable noise level dB(A) Residential Bed room 25 Living room 40 Commercial Office 35-45 Conference 40-45 Restaurants 40-45 Industrial Work shop 40-60 Laboratory 40-50 Educational Class room 30-40 Library 35-40 Hospitals Wards 20-35 Ref: Park 25th edition Pgno : 779