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
Which of the following regions of the spinal cord is involved first in Friedreich's Ataxia: 
Select and explain. 
A. Dorsal Root ganglion, B. Spinal tracts, C. Peripheral nerve, D. Cerebellum
A: Dorsal Root ganglion
Answer: A: Dorsal Root ganglion 
Explanation: 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.