**Core Concept:** Audiometry is the assessment of hearing using various tests to determine the sensitivity of the auditory system to different frequencies of sound. It is a subjective test as the patient is required to respond to the stimuli and interpret the results based on their perception.

**Why the Correct Answer is Right:**
Subjective tests for audiometry require the patient's active participation and interpretation of the results. The correct answer, **D** (tone-burst audiometry), is an objective test as it measures the auditory response objectively without relying on the patient's perception. In tone-burst audiometry, a pure tone is presented to the patient, and the audiologist measures the auditory brainstem response (ABR) to determine the hearing threshold.

**Why Each Wrong Option is Incorrect:**
A. P pure-tone audiometry is a subjective test as it relies on the patient's perception and response.
B. ABR is an objective test as it measures the auditory brainstem response and does not require patient participation.
C. Discrimination tests assess the patient's ability to discriminate between different sounds or speech sounds, making them subjective tests.

**Clinical Pearl:**
Objective audiometry tests, such as tone-burst audiometry, are essential for assessing hearing loss in patients who may not be able to respond accurately or consistently due to factors like language barriers, cognitive impairment, or poor hearing abilities. ABR is a commonly used objective test that provides valuable information about the auditory system's response to sound stimuli.

**Why the Correct Answer is Right:**
Discrimination tests are subjective tests as they rely on the patient's ability to distinguish between different sounds or speech sounds. In tone-burst audiometry, the patient does not have to interpret or differentiate between sounds; instead, they are simply asked to count the number of bursts they hear.

**Why Each Wrong Option is Incorrect:**
A. Pure-tone audiometry is a subjective test as it assesses the patient's ability to perceive and differentiate sounds.
B. ABR is an objective test, measuring the auditory brainstem response without relying on the patient's perception or response.
C. Speech audiometry is subjective as it relies on the patient's ability to understand and respond to speech sounds, making it dependent on the patient's cognitive abilities and language skills.