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 done in 
Select and explain. 
A. Scala media, B. Scala tympani, C. Scala Vestibuli, D. Middle Ear
B: Scala tympani
Answer: B: Scala tympani 
Explanation: None