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
In otosclerosis during stapedectomy surgery, prosthesis used is - 
Select and explain. 
A. Teflon biston, B. Grommet, C. Total ossicular replacement, D. All
A: Teflon biston
Answer: A: Teflon biston 
Explanation: None