This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'According to FIGO staging, Women diagnosed with choriocarcinoma with metastasis to lungs will be staged under \nSelect and explain. \nA. Stage I, B. Stage II, C. Stage III, D. Stage IV', 'role': 'user'}, {'content': "Answer: C \nExplanation: Anatomical stagingStage IGTN confined to the uterusStage IIGTN extends outside of the uterus but is limited to the genital structures Stage IIIGTN extends to the lungs, with or without genital tract involvementStage IVDistant metastasisReference: William's Obstetrics; 25th edition, chapter 20; Gestational trophoblastic diseases", 'role': 'assistant'}]