**Core Concept**
The vestibular system is responsible for balance, spatial orientation, and equilibrium. Assessing vestibular function is crucial in diagnosing and managing conditions like vertigo, dizziness, and balance disorders. Various tests and examinations are used to evaluate the vestibular system's integrity.

**Why the Correct Answer is Right**
The correct answer is one of the options that does not assess vestibular function. Vestibular function is typically evaluated through tests that assess the vestibulo-ocular reflex (VOR), vestibular-evoked myogenic potentials (VEMPs), or electronystagmography (ENG). These tests help clinicians diagnose vestibular disorders and determine the affected side.

**Why Each Wrong Option is Incorrect**
**Option A:** This option assesses vestibular function by evaluating the vestibulo-ocular reflex (VOR) and electronystagmography (ENG), making it an incorrect choice.
**Option B:** This option is also incorrect as it evaluates vestibular-evoked myogenic potentials (VEMPs), which is a test of vestibular function.
**Option C:** This option is incorrect as it evaluates caloric testing, which is another method to assess vestibular function.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that a comprehensive vestibular assessment involves evaluating both the peripheral and central vestibular systems. A thorough history, physical examination, and vestibular testing can help diagnose and manage vestibular disorders effectively.

**Correct Answer:** D.