This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'In otosclerosis during stapedectomy surgery, prosthesis used is \nSelect and explain. \nA. Teflon piston, B. Grommet, C. Total ossicular replacement, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Stapes is removed and replaced by prosthesis Teflon piston in stapedectomy in otosclerosis. In Stapedectomy / Stapedotomy, fixed otosclerotic stapes is removed and a prosthesis inseed between the incus and oval window. Prosthesis employed may be a Teflon piston, stainless steel piston, platinum - telfon or titanium - Teflon piston. Ref: Diseases of EAR, NOSE and THROAT by PL Dhingra; 7th Edition; page no.97; figure 13.3', 'role': 'assistant'}]