This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Which of the following cranial structures are insensitive to pain \nSelect and explain. \nA. Dural sheath surrounding vascular sinuses, B. Choroid plexus, C. Falx cerebri, D. Middle meningeal aery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The cranium, brain parenchyma, ependymal lining of the ventricles, and choroid plexus are all pain insensitive . Sensitive Insensitive Extracranial Skin, muscles, fasciaBlood vesselsMucosa of sinusesDental structures Skull (except periosteum) Intracranial Large aeries near circle of Willis Parenchyma of brain Large venous sinuses Pia mater, arachnoid mater, pas of duramater Dural aeries and pas of dura Ependyma, choroid plexus Ref - pubmed.com <a href=" </div>', 'role': 'assistant'}]