## Core Concept
The eighth cranial nerve, also known as the vestibulocochlear nerve, is responsible for transmitting sound and balance information from the inner ear to the brain. A palsy or lesion of this nerve can affect both the cochlear (hearing) and vestibular (balance) components.

## Why the Correct Answer is Right
The vestibulocochlear nerve has two main functions:
- The **cochlear part** is involved in hearing, transmitting sound signals from the cochlea to the brain.
- The **vestibular part** is involved in balance, transmitting information from the semicircular canals and otolith organs to the brain.
A lesion in this nerve can lead to hearing loss (conductive or sensorineural) and balance disturbances.

## Why Each Wrong Option is Incorrect
- **Option A:** Vertigo is a symptom that can arise from vestibular dysfunction. Since Cranial Nerve 8 is involved in vestibular function, its palsy can cause vertigo.
- **Option B:** Tinnitus, or ringing in the ears, can be associated with disorders affecting the cochlear part of the eighth cranial nerve.
- **Option C:** Hearing loss is a direct consequence of damage to the cochlear component of Cranial Nerve 8.

## Why Option D is Correct (Implicitly)
- **Option D:** Nausea can indeed be associated with vertigo caused by vestibular dysfunction, which is a symptom of eighth nerve palsy.

## Clinical Pearl / High-Yield Fact
A key point to remember is that a lesion in one of the vestibular nerves or in the inner ear can cause **unilateral** vestibular dysfunction, leading to vertigo. This condition might present with hearing loss if the cochlear component is also affected.

## Correct Answer: D. Nausea.