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: Unknown
[{'content': 'In ca ovary inguinal lymph nodes are involved in stage \nSelect and explain. \nA. Stage II, B. Stage III a, C. Stage IIIc, D. Stage IVb', 'role': 'user'}, {'content': 'Answer: D \nExplanation: FIGO revised the staging of carcinoma ovary in January 2014 and according to the new staging inguinal LN involvement is stage IV b.', 'role': 'assistant'}]