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: Physiology
[{'content': 'Pain-sensitive intracranial structure is: \nSelect and explain. \nA. Piamater, B. Pial vassels, C. Duramater, D. Brain matter', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e.Duramater', 'role': 'assistant'}]