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
Carcinoma cervix is caused by HPV : 
Select and explain. 
A. 18, 21, 33, B. 16, 18, 21, C. 16, 18, 33, D. 16, 21, 33
C: 16, 18, 33
Answer: C: 16, 18, 33 
Explanation: 16, 18, 33