**Question:** Stapedial reflex is absent in:

**Correct Answer:** D.

**Core Concept:** Stapedial reflex is a defensive reflex that involves the involuntary contraction of the stapes footplate in response to loud noises, protecting the ear from potentially damaging sounds. This reflex is essential for maintaining hearing and is mediated by the vestibulocochlear nerve (C7-8).

**Why the Correct Answer is Right:** Stapedial reflex is usually intact in healthy individuals and depends on the integrity of the vestibulocochlear nerve. In case of injury or disease affecting this nerve, such as vestibular neuritis, labyrinthitis, or following vestibular schwannoma surgery (e.g., Mastoidectomy), the reflex may be lost due to the destruction or dysfunction of the involved structures.

**Why Each Wrong Option is Incorrect:**

A. This option is incorrect because the stapedial reflex is normally present in individuals with intact vestibulocochlear nerves. Vestibular disorders, such as those mentioned above, cause the reflex to be absent, not present.

B. This option is incorrect because stapedial reflex is not affected by age or hearing loss per se. While age-related changes may influence the reflex threshold, the reflex itself remains intact.

C. This option is incorrect because stapedial reflex is not significantly affected by ear canal abnormalities or deformities. The reflex is primarily determined by the integrity of the vestibulocochlear nerves, not the ear canal structure.

E. This option is incorrect because the reflex is not influenced by the specific type of ear pathology. The reflex is determined by the integrity of the vestibulocochlear nerves, not the nature of the ear disease.

**Clinical Pearl:** A loss of stapedial reflex, particularly following vestibular neuritis, labyrinthitis, or vestibular schwannoma surgery, is a clinical sign of nerve dysfunction and warrants further evaluation for potential vestibular or auditory system pathology.