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': 'Blood Brain Barrier is/are formed by: \nSelect and explain. \nA. Oligodendrocytes, B. Microglial cell, C. Astrocytes, D. Schwann cell', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Astrocytes; E i.e. Neuroglia', 'role': 'assistant'}]