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: Anaesthesia
[{'content': 'Regarding the epidural space, all are true except \nSelect and explain. \nA. Is a open space, B. Lies outside of the dura mater, C. Ends at the sacrococcygeal  membrane, D. Continues through foramen magnum into the skull', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Epidural space is closed superiorly at foramen magnum.', 'role': 'assistant'}]