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: Gynaecology & Obstetrics
[{'content': 'Endometrial cancer involving 50% of endometrium, extending to vagina, lymph nodes negative with positive peritoneal cytology is staged as \nSelect and explain. \nA. 3a, B. 3b, C. 3c1, D. 3c2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 3b FIGO STAGING OF ENDOMETRIAL CANCER STAGE I Cancer confined to corpus uteri IA --> Limited to endometrium IB --> < 1/2 myometrial thickness IC > 1/2 myometrial thickness STAGE II Tumour involves cervix but does not extend beyond uterus (la --> Cervical glandular involvement llb --> Cervical stromal involvement STAGE III Local and/or regional spread Ilia --> Uterine serosa, positive peritoneal washings Adnexal involvement Ilib -4 Vaginal involvement (lymph node absent) 111c --> Positive lymph node no pelvis and paraaoic lymph node STAGE IV Tumour widespread IVa - Bladder or bowel mucosa IVb --> Distant metastasis', 'role': 'assistant'}]