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
Blood Brain Barrier is/are formed by: 
Select and explain. 
A. Oligodendrocytes, B. Microglial cell, C. Astrocytes, D. Schwann cell
C: Astrocytes
Answer: C: Astrocytes 
Explanation: C i.e. Astrocytes; E i.e. Neuroglia