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
The conduction velocity of C fibers is about: M/second 
Select and explain. 
A. 2, B. 5, C. 10, D. All
A: 2
Answer: A: 2 
Explanation: The conduction velocity of c type nerve fibers is about 2 M/second They are non myelinated and has least diameter Ref:Guyton and Hall textbook of medical physiology 12th edition,page number,: 73