**Core Concept**
A cochlear implant is a neuroprosthetic device that bypasses damaged portions of the ear and directly stimulates the auditory nerve, allowing individuals with severe to profound sensorineural hearing loss to perceive sound.

**Why the Correct Answer is Right**
Cochlear implants consist of an external sound processor and an internal receiver/stimulator, which is surgically implanted under the skin behind the ear. The sound processor collects sound from the environment and converts it into electrical signals, which are then transmitted to the internal receiver/stimulator. The stimulator converts these electrical signals into electrical impulses that directly stimulate the auditory nerve, bypassing damaged hair cells in the cochlea. This allows individuals with severe to profound sensorineural hearing loss to perceive sound, although the perception may not be as clear as natural hearing.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because cochlear implants do not restore natural hearing, but rather provide a new pathway for sound perception.

**Option B:** This option is incorrect because cochlear implants do not affect the middle ear, but rather bypass damaged portions of the inner ear.

**Option C:** This option is incorrect because cochlear implants are not a cure for hearing loss, but rather a treatment option for individuals with severe to profound sensorineural hearing loss.

**Clinical Pearl / High-Yield Fact**
It's essential to note that cochlear implants are not suitable for all individuals with hearing loss, and the decision to implant should be made on a case-by-case basis, taking into account the individual's type and severity of hearing loss, as well as their overall medical and cognitive status.

**Correct Answer: A.**