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
The decibels above which auditory fatigue occurs is 
Select and explain. 
A. 60 db, B. 70 db, C. 85 db, D. 140 db
C: 85 db
Answer: C: 85 db 
Explanation: A daily exposure up to 85db is about the limit people can tolerate without substantial damage to their hearing.Auditory fatigue: It appears in the 90dB region and greatest at 400Hz. It may be associated with side effects such as whistling and buzzing in the ears.Park 23e pg: 742