This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'The nerve root blocked in pudendal block is \nSelect and explain. \nA. L 1,2,3, B. L 2,3, C. S 2,3,4, D. S 4', 'role': 'user'}, {'content': "Answer: C \nExplanation: Pudendal nerve block : Pudendal nerve arises from S2,3,4. Doesn't relieve the pain of labor Cause perineal analgesia and relaxation Ref: Dutta Obs 9e pg 480.", 'role': 'assistant'}]