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
Commonest cause of pyometra is : 
Select and explain. 
A. Carcinoma endometrium, B. Carcinoma cervix, C. Carcinoma vagina, D. Uterine myoma
B: Carcinoma cervix
Answer: B: Carcinoma cervix 
Explanation: Carcinoma cervix