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: Pathology
The function of oligodendrocyte is - 
Select and explain. 
A. Myelinates the CNS, B. Nutrition of nervous tissue, C. Lining the cavities of the CVS, D. Behave like macrophages
A: Myelinates the CNS
Answer: A: Myelinates the CNS 
Explanation: The principal function of oligodendrocytes is the production and maintenance of myelin in CNS - Robbins

Myelination in Central nervous system → Oligodendrocytes
Myelination in Peripheral nervous system → Schwann cells