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
Most common cause of pyometra is : 
Select and explain. 
A. Senile endometriosis, B. Carcinoma endometrium, C. Carcinoma cervix, D. Carcinoma ovary
B: Carcinoma endometrium
Answer: B: Carcinoma endometrium 
Explanation: Carcinoma endometrium