This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Assessment of Vestibular Function, Subject name: ENT
Difference between central and peripheral vertigo: 
Select and explain. 
A. Nystagmus associated with central vertigo is unidirectional, B. Purely horizontal nystagmus without torsional component is common in central vertigo, C. Central is more severe than peripheral vertigo, D. Tinnitus and deafness are often present in central vertigo
B: Purely horizontal nystagmus without torsional component is common in central vertigo
Answer: B: Purely horizontal nystagmus without torsional component is common in central vertigo 
Explanation: Ans. b (Purely horizontal nystagmus without torsional component is common in central vertigo). (Ref. Harrison's medicAine 16th ed. 132)Differentiation Between Peripheral (Labyrinth) And Central (Brainstem/Cerebellum) Vertigo FeaturesPeripheral vertigoCentral vertigo1Direction of associated nystagmusUnidirectional (fast phase opposite lesion)Bi or unidirectional2Purely horizontal nystagmus without torsional componentUncommonCommon3Vertical or purely torsional nystagmusNever presentMay be present4Visual fixationInhibits nystagmus and vertigoNo inhibition5Severity of vertigoMarkedMild6Direction of spinTowards fast phaseVariable7Direction of fallTowards slow phaseVariable8Duration of symptomsFinite (minutes/ days/ weeks),May be chronic but recurrent9Tinnitus and/deafnessOften presentUsually absent10Associated central abnormalitiesNoneExtremely common11Common causesLabyrinthitis, Meniere's, vestibular neuronitis, Ischemia, trauma, toxinVascular, demyelinating, neoplasms