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
Bilateral hydronephrosis is seen in? 
Select and explain. 
A. Vaginal carcinoma, B. Carcinoma cervix stage 3 or 4, C. Hepatic cirrhosis, D. Colon cancer
B: Carcinoma cervix stage 3 or 4
Answer: B: Carcinoma cervix stage 3 or 4 
Explanation: (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.