This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Most preferred technique for painless labour \nSelect and explain. \nA. Lumbar epidural, B. Sacral epidural, C. Lumbar + sacral epidural (double catheter technique), D. Para cervical block', 'role': 'user'}, {'content': 'Answer: A \nExplanation: the lumbar epidural replaced caudal analgesia as the preferred technique. Compared with the caudal route, lumbar epidural analgesia is more comfoable for the patient and easier to perform. The technique required less local anesthetic.. Ideally, an epidural is staed when the woman is at least four centimetres dilated and in active labour (having strong and regular contractions) Ref Robbins 9/e pg 456', 'role': 'assistant'}]