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: Physiology
Protein filtration across cerebral capillaries is limited by: 
Select and explain. 
A. Fibrous tissue, B. Foot process of astrocytes, C. Low BP, D. High CSF pressure
B: Foot process of astrocytes
Answer: B: Foot process of astrocytes 
Explanation: B i.e. Foot process of astrocytes Blood Brain Barrier (BBB)