This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve Muscle Physiology, Subject name: Physiology
Which group of nerve fibre is least susceptible to hypoxia? 
Select and explain. 
A. A alpha, B. A beta, C. B, D. C
D: C
Answer: D: C 
Explanation: Susceptibility Most susceptible Intermediate Least Susceptible Hypoxia B A C Pressure A B C