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
. 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: 
Select and explain. 
A. Korsakoff's psychosis, B. Wernicke encephalopathy., C. De Clerambault syndrome, D. Delirium tremens
B: Wernicke encephalopathy.
Answer: B: Wernicke encephalopathy. 
Explanation: B i.e. Wernicke encephalopathy