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': 'Which investigation is not done in FIGO staging of CA cervix: \nSelect and explain. \nA. Cystoscopy, B. Chest X-ray, C. Pelvic ultrasound, D. IVP', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]