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': "A 45 year male with a history of alcohol dependence presents with confusion, nystagmus and ataxia. Examination reveals 6th cranial nerve weakness. He is most likely to be suffering from : \nSelect and explain. \nA. Korsakoff's psychosis, B. Wernicke encephalopathy, C. DeClerambault syndrome, D. Delirium tremens", 'role': 'user'}, {'content': "Answer: B \nExplanation: Confusion, nystagmus, ataxia and 6th cranial nerve weakness in an alcohol dependent patient suggest the diagnosis of Wernicke's encephalopathy.", 'role': 'assistant'}]