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: Surgery
Over the past 10 years, a 50-year-old male has had progressive difficulty hearing, paicularly on the left side. Audiometry testing reveals that he has a bone conduction type of deafness. Which of the following conditions is he most likely to have? 
Select and explain. 
A. Otosclerosis, B. Cholesteatoma, C. Schwannoma, D. Otitis media
A: Otosclerosis
Answer: A: Otosclerosis 
Explanation: Otosclerosis can be familial, paicularly when it is severe. It results from fibrous ankylosis followed by bony overgrowth of the little ossicles of the middle car. A schwannoma typically involves the eighth cranial nerve and results in a nerve conduction form of deafness. Schwannomas are usually unilateral. although familial neurofibromatosis could result in the appearance of multiple schwannomas. A cholesteatoma is typically a unilateral process that complicates chronic otitis media in a child or young adult otitis media by itself is usually self- limited and uncommon in an adult Chondrosarcomas may involve the skull in older adults but are rare and are solitary bulky masses in the region of the jaw.