This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
[{'content': 'Pain insensitive structure in brain is \nSelect and explain. \nA. Falx cerebri, B. Dural she ath surrounding vascular sinuses, C. Middle meningeal aery, D. Choroid plexus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pain Insensitive structures in Brain :Brain parenchymaEpendymaChoroid plexusPia matterArachnoidDura over convexity of skull ( Dura around vascular sinuses and vessels is sensitive to pain)Pain Sensitive structures in Brain :Cranial venous sinuses with afferent veinsAeries at base of brain and aeries of dura including middle meningeal aery.(Ref: Gray&;s anatomy, page 404)', 'role': 'assistant'}]