This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Myelination in peripheral nervous system is done by 
Select and explain. 
A. Astrocytes, B. Oligodendrocyte, C. Ependymal cells, D. Schwann cells
D: Schwann cells
Answer: D: Schwann cells 
Explanation: In PNS myelination is done by schwann cells In CNS myelination is done by oligodendrocytes Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:671,672,673