This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of menstruation, Subject name: Gynaecology & Obstetrics
Which of the following reduces the risk of Pelvic inflammatory Disease(PID)? 
Select and explain. 
A. Copper T IUCD, B. TODAY vaginal sponge, C. Spermicidal agents, D. Oral contraceptives pills(OCPs)
D: Oral contraceptives pills(OCPs)
Answer: D: Oral contraceptives pills(OCPs) 
Explanation: Oral contraceptive Pills reduce the risk od PID by preventing the ascent of bacteria from the vagina, by thickening the cervical mucus (due to the progesterone content) and decresinng motility of the female genital tract (FGT). Mirena, DMPA and progesterone only Pills (POPs) also thicken the cervical mucus and reduce PID. There is no evidence suggesting the reduction of incidence of PID with spermicidal agents. Ref: Shaw&;s textbook of Gynaecology 17th edition Pgno: 264