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': 'In spinal anaesthesia drug is deposited between: \nSelect and explain. \nA. Mater and duramater, B. Piamater and arachnoid, C. Below duramater, D. Above piamater', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Piamater and arachnoid', 'role': 'assistant'}]