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: Pathology
[{'content': 'The ___________ is the innermost meningeal layer, clings tightly to the surface of the brain and spinal cord, following every fold. \nSelect and explain. \nA. Arachnoid mater, B. Pia mater, C. Dura mater, D. Tentorium cerebelli', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B:\xa0The innermost layer that contours closely to the many folds and crevices of the brain is called the\xa0pia mater.\nA:\xa0The\xa0arachnoid or arachnoid mater\xa0is the middle layer of the meninges.\nC:\xa0Dura mater\xa0is the outermost layer of the meninges.\nD:\xa0Tentorium cerebelli\xa0is an extension of the dura mater that separates the cerebellum from the inferior portion of the occipital lobes.', 'role': 'assistant'}]