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: Gynaecology & Obstetrics
[{'content': 'The nerve roots blocked in pudendal nerve block is: \nSelect and explain. \nA. L1,2,3, B. L2,3, C. S2,3,4, D. S4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pudendal nerve block:\n\nPudendal nerve arises from: S2, S3, S4 and therefore pudendal nerve block - will block S2, S3, S4, nerve roots.\nIt is used for perineal analgesia and relaxation.\nAnaesthesia used is 20 ml of 1% lignocaine.\nRoute: Transvaginal and perineal route.\nSite: Pudendal nerve is blocked just above the tip of ischial spine.\n\nIndications:\n\nPrior to application of forceps or vacuum\nTo suture vaginal lacerations\nIn Assisted breech delivery.', 'role': 'assistant'}]