This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sensory System, Subject name: Physiology
The first-order (primary afferent) cell bodies of the dorsal column-medial lemniscal system are found in which structure? 
Select and explain. 
A. Spinal cord dorsal horn, B. Spinal cord ventral horn, C. Dorsal root ganglia, D. Nucleus cuneatus
C: Dorsal root ganglia
Answer: C: Dorsal root ganglia 
Explanation: Primary afferent neuronal cell bodies are found in the dorsal root ganglia.