<prompt> Pelvic Inflammatory Disease occurs least common with :OCPsCondomIUCDDiaphragm  <response>: Ans. is b i.e. Condom Barrier methods especially condom and OCPs both protect against PID, but the protection offered by OCPs is less than that by Barrier method. The incidence of pelvic inflammatory disease P1D is reduced. though it does not reach the same low level as seen with the barrier methods. As far as diaphragm is concerned, it does not protect against HIV, whereas condom does. 