This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
In radical mastoidectomy all the following are done except 
Select and explain. 
A. Lowering of facial ridge, B. Mucosa and middle ear muscles are removed, C. All the ossicles are removed except the stapes foot plate, D. Maintains patency of eustachian tube
D: Maintains patency of eustachian tube
Answer: D: Maintains patency of eustachian tube 
Explanation: .