This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Nerve Injury, Subject name: Orthopaedics
[{'content': 'A 10-year-old boy has severed his radial nerve. Which of the following cells plays a major role in axonal regrowth? \nSelect and explain. \nA. Fibrous astrocytes, B. Fibroblasts, C. Oligodendrocytes, D. Schwann cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Schwann cells play a major role in axon regeneration (axon regrowth) in the PNS', 'role': 'assistant'}]