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': 'A lady presented with carcinoma endometrium involving >50% of myometrium extending to vagina and positive peritoneal cytology but no involvement of para aoic and preaoic nodes. What is the stage of disease ? \nSelect and explain. \nA. Ill A, B. Ill B, C. Ill C1, D. Ill C2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Endometrial cancer stage III: Stage IIIA: Involvement of uterine serosa and/ or adnexa Stage IIIB: Involvement of vagina and/or parametrium Stage IIIC: IIIC1: Positive Pelvic nodes IIIC2: Positive Paraaoic nodes with or without positive pelvic nodes Positive peritoneal cytology doesn&;t alter the stage Ref: FIGO SURGICAL STAGING 2014', 'role': 'assistant'}]