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
Mechanical stimulation of the pain sensitive structures of the brain can cause headache. All of the following are the pain sensitive structures of brain, EXCEPT? 
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: Pain sensitive structures of the brain are,Middle meningeal aeryDural sinusesFalx cerebriProximal segments of the large pial aeriesVentricular ependyma, choroid plexus, pial veins, and much of the brain parenchyma are insensitive to the pain.