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: Anatomy
Pain insensitive structure in brain is: 
Select and explain. 
A. Falx cerebri, B. Dural sheath surrounding vascular sinuses, C. Middle meningeal aery, D. Choroid plexus
D: Choroid plexus
Answer: D: Choroid plexus 
Explanation: Choroid plexus Repeat from Al 2009Choroid plexus is pain insensitive structure.Harrison writes-"Relatively .few cranial structures are pain-producing; these include the scalp, middle meningeal aery, dural sinuses, .falx cereberi, and proximal segments of the large pial aeries. The ventricular ependyma, Choroid plexus, pial veins, and much of the brain parenchyma are not pain-producing."Pain SensitivePain InsensitiveScalpPia-arachnoidPeriostiumPial veinsDural sinusesBrain parenchymaMiddle meningeal aeryVentricular ependymaFalx cereberiChoroid plexusProximal segments of the large pial aeries