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': "Which of the following regions of the spinal cord is involved first in Friedreich's Ataxia: \nSelect and explain. \nA. Dorsal Root ganglion, B. Spinal tracts, C. Peripheral nerve, D. Cerebellum", 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is A (Dorsal Root Ganglion): The first pathological changes in Friedreich's ataxia are thought to occur in the dorsal root ganglia with loss of large sensory neurons Ref: Clinical Neurology by Goetz.", 'role': 'assistant'}]