This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Otosclerosis, Subject name: ENT
[{'content': '"Boiler\'s notch" is suggestive of ? \nSelect and explain. \nA. Conductive Hearing Loss, B. Noise Induced Hearing Loss (NIHL), C. Both 1 and 2, D. Normal Finding', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Boiler notch/Acoustic dip is seen in Noise induced hearing loss NIHL Boiler notch at 4000Hz Notch is seen in BC curve AC curve notch are insignificant Maximum seen at 3000-6000Hz Sound causing maximum NIHL 2000-3000Hz Stereocilia of Outer hair cells are first to be affected', 'role': 'assistant'}]