This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
In CNS, myelin sheath of Neurons is formed by: 
Select and explain. 
A. Astrocytes, B. Oligodendroglia cells, C. Schwann cells, D. All the above
B: Oligodendroglia cells
Answer: B: Oligodendroglia cells 
Explanation: ANSWER (B) Oligodendroglia cellsREF: Basic histology, Carlos & Jose, 11th edition, Chapter 9. Nerve Tissue 8c the Nervous SystemThe myelin sheath is produced by oligodendrocytes in the central nervous system and by Schwann cells in the peripheral nervous system.