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': 'A perimenopausal lady with well differentiated adenocarcinoma of uterus has more than half myometrial invasion, vaginal metastasis and inguinal lymph node metastasis. She is staged as: \nSelect and explain. \nA. Stage IIIB, B. Stage IIIC, C. Stage IV A, D. Stage IV B', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The lady in above question has cancer spread to inguinal lymph nodes i.e. stage IVB.', 'role': 'assistant'}]