This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': "Charcot's joint seen in A/E - \nSelect and explain. \nA. Syringomyelia, B. Diabetes, C. Hydrocephalus, D. Arnold-chiari malformation", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrisons 20e p2642', 'role': 'assistant'}]