When is a cochlear implant used?

(a) When the sensory hair in the auditory canal have been damaged

(b) When the tympanic membrane has been damaged

(c) When the ossicular chain has been damaged

(d) When the fluid in the eustancian tube has been dis-balanced

The question was posed to me during an interview for a job.

The doubt is from Artificial Organs in division Rehabilitation and Recovery of Clinical Science

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