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': 'Where does the main part of vertebral venous plexus lie \nSelect and explain. \nA. Subdural space, B. Epidural space, C. Subarachnoid space, D. Outside the vertebra', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Vertebral venous plexus lies in the epidural space.', 'role': 'assistant'}]