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
Cochlear implant is done in: 
Select and explain. 
A. Scala vestibuli, B. Scala tympani, C. Cochlear duct, D. Endolymphatic duct
B: Scala tympani
Answer: B: Scala tympani 
Explanation: MIC Surgical approach for placing cochlea implant = Facial Recess approach (Posterior tympanotomy) which involves doing a coical I mastoidectomy. From the middle ear the electrodes are then introduced into the scala tympani through the round window. Recently Veria technique (Non-Mastoidectomy technique) is gaining popularity for cochlear implantation. It uses transcanal approach.Advantage of Vera techniqueSimpleLess chances of injuring facial nerveSuitable in young children where mastoid has not developed fully.