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
A child with congenital hearing loss is brought for cochlear implantation. For the implantation, the following structure should be intact: 
Select and explain. 
A. Outer hair cell, B. Inner hair cell, C. Spiral ganglion cell, D. Auditory nerve
D: Auditory nerve
Answer: D: Auditory nerve 
Explanation: Cochlear implants are neural prostheses that conve sound energy to electrical signals and can be used to stimulate the auditory division of the eighth nerve directly. Successful cochlear implantation requires an intact and functional auditory processing pathway, from spiral ganglion cells to the auditory coex.