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
[{'content': 'Mirena is : \nSelect and explain. \nA. Used in aboions, B. Antiprogesterone, C. Progesterone IUCD, D. Harmonal implant', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c i.e. Progesterone IUCD Mirena is a progesterone IUCD. It contains 52mg levonorgesterel. eluting 20pg daily. Life span- 5 years Failure rate = 0.1-0.4/HMY Mode of action : * Inhibits feilisation Thickens cervical mucus Inhibits sperm function Suppresses endometrium and prevents implantation and inhibits ovulation only in 10-15% cases. Within first seven days of onset of menstruation Immediately after first or second trimester termination of pregnancy After 6 weeks postpaum with contraception for 7 days.', 'role': 'assistant'}]