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': 'Ovarian tumor limited to true pelvis with Negative nodes histological confirmed seeding of abdominal poioned surface. The exact grading : \nSelect and explain. \nA. III A, B. III B, C. III C, D. IV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: III A', 'role': 'assistant'}]