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': 'Pudendal Nerve Block Involve \nSelect and explain. \nA. LiL2L3, B. L2L3L4, C. SiS2S3, D. S2S3S4', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. S2 S3 S4', 'role': 'assistant'}]