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': 'Postganglionic fibers are example of: \nSelect and explain. \nA. Type C fibers, B. Type A, C. Type B, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Postganglionic fibers are example of type C fibers They are non myelinated and have slow conduction velocity They have minimal diameter Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:73', 'role': 'assistant'}]