This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction to Central Nervous System, Subject name: Physiology
Slow conduction velocity is seen with which of the following nerve fibers? 
Select and explain. 
A. Preganglionic autonomic nerve fibers, B. Postganglionic autonomic nerve fibers, C. Motor nerves, D. Sympathetic nerve fibers
B: Postganglionic autonomic nerve fibers
Answer: B: Postganglionic autonomic nerve fibers 
Explanation: Slow conduction velocity is seen in 'C'- fibers because they are unmyelinated. These are post ganglionic sympathetic nerve fibers.