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': 'A patient comes with carcinoma cervix who has completed radiotherapy comes with uraemia. The most common cause is : \nSelect and explain. \nA. Bilateral ureter invasion, B. Radiation nephritis, C. Ureteric stenosis due to radiation, D. Unconnected causes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bilateral ureter invasion', 'role': 'assistant'}]