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: Anatomy
Oligodendrocytes are impoant in : 
Select and explain. 
A. Blood brain barrier, B. Myelin formation, C. Phagocytosis, D. Chemotaxis
B: Myelin formation
Answer: B: Myelin formation 
Explanation: B i.e. Myelin formationMn: "1SPM - degCMO" i.e., Schwann cell Mylinate peripheral nervous system in 1:1 basis ; and Central nervous system is mylinated by Oligndendrocyte in 1:50 basis.