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': 'Tuohy needle is used for – \nSelect and explain. \nA. Spinal anaesthesia, B. Epidural anaesthesia, C. CSF tapping, D. Biopsy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tuohy needle is the most commonly used needle for epidural anesthesia. Other one is crawford needle.', 'role': 'assistant'}]