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
Sound intensity of whispering 
Select and explain. 
A. 30 dB, B. 60 dB, C. 90 dB, D. 120 dB
A: 30 dB
Answer: A: 30 dB 
Explanation: Ans. is 'a' i.e., 30 dB * Following are intensities when a person is at a distance of one meter from sound source.Whisper30 dBNormal conversation60 dBShout90 dBDiscomfort of ear120 dBPain in ear130 dB