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': '. Stage III B endometrial Ca -true is:a) Vaginal metastasisb) Lymph node metastasisc) Bowel involvementd) Lung metastasise) Serosa involved \nSelect and explain. \nA. a, B. b, C. ab, D. ae', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]