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': 'Slow conduction velocity is seen with which of the following nerve fibers \nSelect and explain. \nA. Preganglionic autonomic nerve fibers, B. Postganglionic autonomic nerve fibers, C. Sympathetic nerve fibers, D. Motor nerves', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ref:- Ganong's Review of Medical Physiology 25th ed; pg num:- 94", 'role': 'assistant'}]