This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Obs), Subject name: Gynaecology & Obstetrics
Regarding the mode of contraception below, all are true except? 
Select and explain. 
A. Least failure rate, B. Contains etonogestrel, C. Does not inhibit ovulation, D. Effective for 3 years
C: Does not inhibit ovulation
Answer: C: Does not inhibit ovulation 
Explanation: Ans. C. Does not inhibit ovulationa. This is IMPLANON single rod, progesterone only, containing etonogestrel 68mgb. Releasing 67mg/dayc. Recommended for 3 yearsd. Least failure rate among all contraceptives is with Implanon =0.01% Inhibition of ovulation main mechanism, along with the progestational changes on cervical mucuse. Site: medial aspect of non dominant armf. Nexplanon is radiopaque implantg. Most common side effect with implant is irregular vaginal bleedingh. Unlike injectable DMPA, return of fertility post removal is prompt