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 following is not myelinated 
Select and explain. 
A. A, B. B, C. C, D. All
C: C
Answer: C: C 
Explanation: According to erlanger and gasser classification type c fibers are not myelinated They are small fibers wiwi small diameter and least conduction velocity Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:73