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
[{'content': 'Which of the following cranial structures are insensitive to pain? \nSelect and explain. \nA. Falx cerebri, B. Choroid Plexus, C. Middle meningeal Aery, D. Dural sheath surrounding vascular sinuses', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Among the given options choroid plexus is the only pain insensitive structures, while rest are pain sensitive ones.', 'role': 'assistant'}]