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
Blood brain barrier is absent in ? 
Select and explain. 
A. Adenohypophysis, B. Neurohypophysis, C. Hypothalamus, D. Thalamus
B: Neurohypophysis
Answer: B: Neurohypophysis 
Explanation: Ans. is 'b' i.e., Neurohypophysis