This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
[{'content': 'In classical caesarean section more chances of rupture of uterus is in: \nSelect and explain. \nA. Upper uterine segment, B. Lower uterine segment, C. Uterocervical junction, D. posterior uterine segment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Upper uterine segment is at more risk of rupture in case of a previous classical cesarean section. Here incision is made on the anterior uterine wall in the upper segment above the reflection of uterovesical fold of peritoneum. It is because such a scar is difficult to appose and healing is not good because of frequent contractions and retraction during puerperium. (Sheila TB of obstetrics 2nd edtn pg 338)', 'role': 'assistant'}]