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
Which among the following is NOT a pain sensitive structure in the brain? 
Select and explain. 
A. Middle meningeal aery, B. Falx cerebri, C. Dural sinuses, D. Choroid plexus
D: Choroid plexus
Answer: D: Choroid plexus 
Explanation: Relatively few cranial structures are pain-producing; these include the scalp, middle meningeal aery, dural sinuses, falx cerebri, 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. Ref: Goadsby P.J., Raskin N.H. (2012). Chapter 14. Headache. In D.L. Longo, A.S. Fauci, D.L. Kasper, S.L. Hauser, J.L. Jameson, J. Loscalzo (Eds), Harrison's Principles of Internal Medicine, 18e.