This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrics and gynaecology, Subject name: Radiology
[{'content': 'Point A in radiotherapy for carcinoma cervix corresponds to \nSelect and explain. \nA. Lateral pelvic lymph nodes, B. Urinary bladder, C. Rectum, D. Uterine vessel crossing the ureter', 'role': 'user'}, {'content': 'Answer: D \nExplanation: <img alt="" src=" />', 'role': 'assistant'}]