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': 'Staging of ovarian cancer when rectum is involved \nSelect and explain. \nA. Stage I, B. Stage 2, C. Stage 3, D. Stage 4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: -Stage II ovarian cancer: tumor involves one or both ovaries or fallopian tubes with pelvic extension or primary peritoneal cancer. IIA: ovarian tumor involving uterus or fallopian tubes IIB: ovarian tumor involving pelvic intraperitoneal organs ( bladder, rectum or pelvic side walls) Reference : textbook of gynaecology Sheila balakrishnan, 2nd edition, pg no:277 <\\p>', 'role': 'assistant'}]