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
Myelination in CNS is done by- 
Select and explain. 
A. Astrocytes, B. Oligodendrocytes, C. Ependymal cells, D. Microglia
B: Oligodendrocytes
Answer: B: Oligodendrocytes 
Explanation: Ans. is 'b' i.e., Oligodendrocytes * Myelination in central nervous system - Oligodendrocytes* Myelination in peripheral nervous system - Schwann cell