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
[{'content': 'The following is not myelinated \nSelect and explain. \nA. A, B. B, C. C, D. All', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]