<prompt> Wemicke-Korsakoff syndrome is due:Riboflavin deficiencyThiamine deficiencyPyridoxin deficiencyNiacine deficiency  <response>: Thiamine deficiency: Ref: 403-4-H 169,442-HI7th Alcoholic patients with chronic thiamine deficiency may also have CNS manifestations known as Wernickes encephalopathy consisting of horizontal nystagmus, ophthalmoplegia, cerebellar ataxis, and mental impairment, when there is an additional loss of memory and a confabulatory psychosis, the syndrome is known as Wernicke Korsakoff syndrome. 