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
Landmark of geniculate ganglion for facial nerve decompression: 
Select and explain. 
A. Pyramid, B. Processus cochleariformis, C. Incus neck, D. Oval window
B: Processus cochleariformis
Answer: B: Processus cochleariformis 
Explanation: Ans. B. Processus cochleariformisExplanationProcessus cochleariformis. It demarcates the geniculate ganglion which lies just anterior to it. Tympanic segment of the nerve starts at this level.Oval window and horizontal canal. The tympanic segment of facial nerve runs above the oval window (stapes) and below the horizontal canal.Short process of incus. Facial nerve lies medial to the short process of incus at the level of aditus.Pyramid. Nerve runs behind the pyramid and the posterior tympanic sulcus.