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
Pelvic Inflammatory Disease occurs least common with : 
Select and explain. 
A. OCPs, B. Condom, C. IUCD, D. Diaphragm
B: Condom
Answer: B: Condom 
Explanation: Ans. is b i.e. Condom Barrier methods (especially condom) and OCP's both protect against PID, but the protection offered by OCP's 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.