This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous Nervous System, Subject name: Physiology
[{'content': 'Protein filtration across cerebral capillaries is limited by- \nSelect and explain. \nA. Fibrous tissue, B. Foot process of astrocytes, C. Low BP, D. High CSF pressure', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' is Foot process of astrocytes. Blood brain barrier does not allow filtration of any substances across it except for lipid soluble substances.It is formed by thetight junctions of the endothelial cells*foot processes of the astrocytes around the capillaries*Also rememberAreas outside the blood brain barrierPosterior pituitary*Area postrema*OVLT (Organum vasculosum of the lamina terminalis)*Subfornical organ*These are collectively k/a circumventricular organs*.", 'role': 'assistant'}]