<prompt> Most common cause of CA cervix:HPV 6 and 18HPV16andl8HPV 6HPV 6 and 11  <response>: Ans. b HPV 16 and 18Ref. Shaws 15th ed, 952 Women with STD, HIV infection, herpes simplex virus 2 infection, human papilloma virus HPV infection 16, 18, 31, 33 or condylomata have a high predisposition to cancer. Of these, HPV is now considered the most important cause, most commonly cause by HPV 16 and 18 Most HPV infection 16, 18 are symptomless in young women and clear within 2 years. Persistent infection is the cause of cancer of the cervix in 70-90 cases. 