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
Which of the following agents is most commonly associated with carcinoma cervix: 
Select and explain. 
A. HPV 16, B. HPV 18, C. HPV 33, D. HPV 35
A: HPV 16
Answer: A: HPV 16 
Explanation: Human Papilloma Virus (HPV) 16 is the most common cause of invasive squamous cervical cancer (followed by HPV 18). Squamous cell carcinoma is the most common cause of cervical cancer worldwide. Ref: COGDT, 10th Edition, Pages 834, 835; William's Gynaecology, 1st Edition, Page 619; Human Cancer Viruses : Principles of Transformation and Pathogenesis By John nicholas, 2008, Page 4; The Encyclopedia of Sexually Transmitted Diseases By Jennifer Shoquist, Diane Stafford, Page 59.