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': "Frenkel's exercise is done in case of- \nSelect and explain. \nA. MND, B. Myopathy, C. Syringomyelia, D. Tabes dorsalis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]