What is the most common symptom of vestibular dysfunction?
A. Nausea and vomiting
B. Limb ataxia
C. Disequilibrium
D. Vertigo
E. Upward beat nystagmus
ANS: D
Rationale: The most common symptom of vestibular dysfunction is vertigo. Nausea and vomiting may occur, and disequilibrium may occur due to abnormal vestibulospinal tract signals. Limb ataxia is usually a cerebellar sign. Upward beat nystagmus is unusual and occurs with anterior semicircular canal Benign Paroxysmal Positional Vertigo (BPPV).
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