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
Relationship between nerve thickness and conduction velocity of myelinated nerves is: 
Select and explain. 
A. Linear, B. Parabolic, C. Hyperbolic, D. No relation
A: Linear
Answer: A: Linear 
Explanation: Fiber diameter (thickness) and conduction velocity relationship:  The relationship is linear  for  myelinated  axons  and  parabolic relation for non­myelinated axons.