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': "Pyramidal tract involvement with absent arikle jerk is seen in - \nSelect and explain. \nA. Frederich's ataxia, B. Subacute combined degeneration of the spinal cord, C. Lathyrism, D. Tabes dorsalis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]