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
A lady presented with carcinoma endometrium involving >50% of myometrium extending to vagina and positive peritoneal cytology but no involvement of para aortic and pre aortic nodes. What is the stage of disease 
Select and explain. 
A. Ill A, B. Ill C2, C. Ill C1, D. Ill B
D: Ill B
Answer: D: Ill B 
Explanation: 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 Paraaortic nodes with or without positive pelvic nodes

​Positive peritoneal cytology doesn't alter the stage