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
Basal lamina of blood vessel in CNS is secreted by 
Select and explain. 
A. Endothelial cells, B. Oligodendrocytes, C. Microglia, D. Astrocytes
A: Endothelial cells
Answer: A: Endothelial cells 
Explanation: None