This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Unmyelinated fibers differ from myelinated fibers in that they: 
Select and explain. 
A. Have increased excitability, B. Have no nodes of Ranvier, C. Have no power of regeneration, D. Have no association of Schwann cells
B: Have no nodes of Ranvier
Answer: B: Have no nodes of Ranvier 
Explanation: None