This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': "A 45 year old 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. De Clerambault syndrome, D. Delirium tremens", 'role': 'user'}, {'content': "Answer: B \nExplanation: Wernicke encephalopathy is characterised by a triad of confusion, ophthalmoplegia and ataxia in an alcoholic patient Ref : Harrison's Principles of Internal Medicine 21st ed", 'role': 'assistant'}]