This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
All the following structures have Blood-Brain Barrier except 
Select and explain. 
A. Pineal body, B. Hypophysis cerebri, C. Area postrema to IV ventricle, D. Mammilary body
D: Mammilary body
Answer: D: Mammilary body 
Explanation: Some areas of the brain are devoid of the blood-brain barrier. These include pineal body, hypophysis cerebri, choroid plexuses and area postrema in fouh ventricle of brainReference: Chourasia; 6th edition; 462 page