This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic & Operative ENT, Subject name: ENT
All of the following are removed in radical mastoidectomy except? 
Select and explain. 
A. Chorda tympani, B. Incus, C. Posterior meatal wall, D. Stapes
D: Stapes
Answer: D: Stapes 
Explanation: Ans. is 'd' i.e., Stapes Radical Mastoidectomyo It is an operation to eradicate disease of the middle ear and mastoid in which mastoid, midd le ear, attic and the antrum are exteriorised into the external ear by removal of posterior meatal wall. All remnants of tympanic membrane, malleus, incus (not the stapes), chorda tympani and the mucoperiosteal lining are removed, and the opening of eustachian tube closed by packing a piece of muscle or cartilage into the eustachian tube.