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: Medicine
[{'content': "All are associated with Wernicke's encephalopathy,except - \nSelect and explain. \nA. Cog-wheel rigidity, B. Alteration in mental function, C. VIth nerve palsy, D. Ataxia", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]