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 needle is piereced upto - \nSelect and explain. \nA. Subdural space, B. Extradural space, C. Epidural space, D. Subarachnoid space', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Subarachinoid space, between pia and arachnoid', 'role': 'assistant'}]