<prompt> Which of the following vitamin deficiency cause triad of mental confusion, ophthalmoplegia ataxia:Vit B2Vit B1Vit B6Vit C  <response>: Ans: b. Vit Bl Classically, Wernickes encephalopathy is characterized by the triad of ophthalmoplegia, ataxia, and mental confusion, but confusion a staggering gait are perhaps most common-Synopsis of Psychaitry by Kaplan 11th796-799Thiamine deficiency in its early stage induces anorexia and nonspecific symptoms e.g., irritability, decrease in sho-term memory. Alcoholic patients with chronic thiamine deficiency also may have central nervous system CNS manifestations known as Wernickes encephalopathy, which consists of horizontal nystagmus, ophthalmoplegia due to weakness of one or more extraocular muscles, cerebellar ataxia, and mental impairment 