This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Radiology
[{'content': "A 25-year-male, Intermittent Diplopia, Urinary incontinence, VI Nerve palsy. Most likely diagnosis is: \nSelect and explain. \nA. Acute infarct, B. Multiple sclerosis, C. Intraparenchymal bleed, D. Alzheimer's disease", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B Multiple sclerosisYoung patient with significant neuro-deficits, involvement of periventricular and pericallosal white matter is classical for MS. On MRI McDonalds criteria is used for diagnosis. Venus necklaceQ/Dawson's fingersQ/Ependymal dot-dash signQ seen.", 'role': 'assistant'}]