This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
[{'content': '70yrs old patient diagnosed with ovarian cancer. Surgical staging involving inguinal lymph nodes \nSelect and explain. \nA. Stage IIIA, B. Stage IIIB, C. Stage IVA, D. Stage IV B', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Stage IV: distant metastasis excluding peritoneal metastasis. IVA: pleural effusion with positive cytology. IVB: hepatic and/ or splenic parenchyma metastasis, metastasis to extra abdominal organs (including inguinal lymph nodes and lymph nodes outside of the abdominal cavity) Reference: textbook of gynaecology Sheila balakrishnan, 2nd edition, pg no:277 <\\p>', 'role': 'assistant'}]