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
A patient comes with carcinoma cervix who has completed radiotherapy comes with uraemia. The most common cause is : 
Select and explain. 
A. Bilateral ureter invasion, B. Radiation nephritis, C. Ureteric stenosis due to radiation, D. Unconnected causes
A: Bilateral ureter invasion
Answer: A: Bilateral ureter invasion 
Explanation: Bilateral ureter invasion