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': 'In classical caesarean section more chances of rupture of uterus is in : \nSelect and explain. \nA. Upper uterine segment, B. Lower uterine segment, C. Utero cervical junction, D. Posterior uterine segment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Upper uterine segment', 'role': 'assistant'}]