This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Operative Gynaecology, Subject name: Gynaecology & Obstetrics
[{'content': '39 years female, 40 weeks gestation, 4mm dilated cervix. Which is the safest option for analgesia- \nSelect and explain. \nA. Intramuscular pentazocin, B. Epidural block, C. Pudendal block, D. Premixed nitrous oxide and oxygen', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Epidural block o When complete relief ofpain is needed throughout labour, epidural analgesia is the safest and simplest method.o For Vaginal delivery - a complete block from T10 to S5For Caesarian section - a complete block from T4 to SI is needed.o Paracervical nerve blockUsed for pain relief during first stage of labour.o Pudendal nerve block:Does not relieve pain of labour but produces perineal analgesia and relaxation and is mostly used for forceps and vaginal breech delivery).", 'role': 'assistant'}]