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: Physiology
[{'content': 'First change observed in distal pa, of a cut nerve is : \nSelect and explain. \nA. Axonal degeneration, B. Sprouting, C. Myelin degeneration, D. Schawn cells proliferation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Axonal degeneration', 'role': 'assistant'}]