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': 'Presence of hydronephrosis in staging of carcinoma cervix denotes FIGO disease : \nSelect and explain. \nA. Stage II-B, B. Stage III-A, C. Stage III-B, D. Stage IV-A', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stage III-B', 'role': 'assistant'}]