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': 'Inguinal L.node is found to be involved in a case of ovarian Ca. Revised FIGO staging would be ? \nSelect and explain. \nA. Stage III A, B. Stage IV B, C. Stage III C, D. Stage IV A', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans- B', 'role': 'assistant'}]