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
True about implanon: 
Select and explain. 
A. Releases > 67 ug/day of drug, B. Prevent STD, C. Life span is 3 Years, D. Contains LNG
C: Life span is 3 Years
Answer: C: Life span is 3 Years 
Explanation: Ans. c. Life span is 3 Years Implanon is a single rod subdermal implant with 68 mg of the progestin etonogestrel (ENG), and an ethylene vinyl acetate copolymer cover.It can be used as contraception for 3 years and then replaced at the same site or opposite arm. It is placed in the medial surface of the upper arm 6 to 8 cm from the elbow in the biceps groove within 5 days of onset of menses.Prolonged and frequent bleeding is the most common adverse effect.