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
In Cochlear implants, the electrodes are most commonly placed at: 
Select and explain. 
A. Oval window, B. Round window, C. Horizontal semicircular canal, D. Cochlea
D: Cochlea
Answer: D: Cochlea 
Explanation: The cochlear implant electrodes are placed in the scala tympani of the cochlea. The electrode thus stimulates the cochlear nerve which is a pa of the vestibulo-cochlear nerve (CN VIII).