This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Organic mental disorders, Subject name: Psychiatry
[{'content': 'Wernicke&;s encephalopathy is due to deficiency of \nSelect and explain. \nA. Thiamine, B. Niacin, C. Folic acid, D. Pyridoxine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The commonest cause of the organic amnestic syndrome is chronic alcohol dependence. It is also called as Wernicke-korasakoff syndrome. Wernicke&;s encephalopathy is the acute phase of delirium proceeding to the organic amnestic syndrome, while korasakoff&;s syndrome is the chronic phase of the amnestic syndrome. (Ref: a sho textbook of psychiatry, Niraj Ahuja,7th edition, pg no. 27)', 'role': 'assistant'}]