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
Absent ankle jerk and extensor plantar response is found in - 
Select and explain. 
A. Friedreich's ataxia, B. Tabes dorsalis, C. SACD, D. Vit B deficiency
A: Friedreich's ataxia
Answer: A: Friedreich's ataxia 
Explanation: None