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
In a case of endometrial cancer, if metastasis is seen in the vagina, what FIGO stage it would be : 
Select and explain. 
A. Stage III a, B. Stage III b, C. Stage III c, D. Stage IV a
D: Stage IV a
Answer: D: Stage IV a 
Explanation: Stage IV a