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
[{'content': 'Regarding the mode of contraception below, all are true except? \nSelect and explain. \nA. Least failure rate, B. Contains etonogestrel, C. Does not inhibit ovulation, D. Effective for 3 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]