<prompt> A 25-year-male, Intermittent Diplopia, Urinary incontinence, VI Nerve palsy. Most likely diagnosis is:Acute infarctMultiple sclerosisIntraparenchymal bleedAlzheimers disease  <response>: 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 necklaceQDawsons fingersQEpendymal dot-dash signQ seen. 