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: Pathology
Risk factor of CA cervix ? 
Select and explain. 
A. Smoking, B. Sex at 25 yrs, C. Decreased parity, D. Single sexual paner
A: Smoking
Answer: A: Smoking 
Explanation: Ans. is 'a' i.e., SmokingRisk Factors associated with carcinoma cervix are as follows :?HPV infection - HPV 16: Squamous cell carcinoma, HPV 18: Adenocarcinoma o Early coitarcheIncreased parityMultiple sexual panersSmokersLack of regular PAP smear screeningLong term use of combined oral contraceptive pills