This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Physiology of Hearing, Subject name: ENT
Sound intensity of whispering is: 
Select and explain. 
A. 30 dB, B. 90 dB, C. 2 dB, D. 120 dB
A: 30 dB
Answer: A: 30 dB 
Explanation: The intensity of sound at 1 metre, in various human conversations are as below: Whisper - 30 dB Normal conversation - 60 dB Shout - 90 dB There occurs Discomfo in the ear at 120 dB and pain in the ear at a loudness of 130 dB