This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
[{'content': 'Korsakoff psychosis ? \nSelect and explain. \nA. Thiamine deficiency, B. Folate deficiency, C. Niacin deficiency, D. Niacin deficiency', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Thiamine deficiency", 'role': 'assistant'}]