This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional anaesthesia, Subject name: Anaesthesia
[{'content': 'In spinal anesthesia, the drug is deposited between- \nSelect and explain. \nA. Dura and arachnoid, B. Pia and arachnoid, C. Dura and veebra, D. Into the cord substance', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Between pia and arachnoid in the sub arachnoid space', 'role': 'assistant'}]