This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
First change observed in distal part, of a cut nerve is 
Select and explain. 
A. Axonal degeneration, B. Sprouting, C. Myelin degeneration, D. Schwann cells proliferation
A: Axonal degeneration
Answer: A: Axonal degeneration 
Explanation: Ans. (a) Axonal degeneration(Ref: Ganong, 25th ed/p.89)Axonal degeneration is the earliest to occur followed by degeneration of myelin sheathMacrophages and Schwann cell clear the debris following degenerationThe neurolemma of the nerve fiber doesn't degenerate and remains as a hollow tube