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
[{'content': 'Oligodendrocytes are impoant in : \nSelect and explain. \nA. Blood brain barrier, B. Myelin formation, C. Phagocytosis, D. Chemotaxis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]