This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'Bilateral hydronephrosis is seen in? \nSelect and explain. \nA. Vaginal carcinoma, B. Carcinoma cervix stage 3 or 4, C. Hepatic cirrhosis, D. Colon cancer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Carcinoma cervix stage 3 or 4 # 2 criteria for the diagnosis of Stage IIIB CERVICAL CANCER in the FIGO staging system: tumor fixation to the pelvic side wall and/or the presence of hydronephrosis due to tumor.> Hydronephrosis is an independent poor prognostic indicator of survival in patients with advanced cervical cancer. Bilateral hydro-nephrosis compared to unilateral involvement confers a worse overall prognosis.> Causes of hydronephrosis: BPH, prostate cancer, bladder cancer or kidney cancer, cervical cancer, ovarian cancer or cancer of the womb and physiologically seen in pregnacy.', 'role': 'assistant'}]