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
Encircled area is: 
Select and explain. 
A. Facial recess, B. Fossa incudis, C. Sinus tympani, D. Pyriform fossa
A: Facial recess
Answer: A: Facial recess 
Explanation: (a) Facial recess(Ref. Cummings, 6th ed., 2192)In the given picture, the encircled area is the facial recess through which the round window opening is visible, also see the schematic picture below.Facial recess is used to approach the middle ear through the mastoid, e.g. in cochlear implantation and in intact canal wall surgeries of the mastoid.Schematic picture of facial recess, through which a drill is pointing towards round window: