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': "Absent ankle jerk and extensor plantar response is found in: \nSelect and explain. \nA. Friederich's ataxia, B. Tabes dorsalis, C. SACD, D. Vit B deficiency", 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is A (Friedreich's Ataxia): Absent ankle jerk with extensor planter response is characteristic of Friedreich's ataxia.", 'role': 'assistant'}]