This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
Auditory fatigue is seen at ? 
Select and explain. 
A. 90 dB, 4000Hz, B. 110 dB, 4000Hz, C. 130 dB, 4000Hz, D. 150 dB, 4000Hz
A: 90 dB, 4000Hz
Answer: A: 90 dB, 4000Hz 
Explanation: Ans. is 'a' i.e., 90 dB, 4000Hz Auditory effects of noice Auditory fatigue - 90 dB and 4000 Hz. Deafness - 4000 to 6000 Hz Temporary - Repeated prolonged exposure to 100 dB Permanent> Single exposure to - 160 dB (due to rupture of ear drum) This question is a repeat from NEET 2012-13