This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraception, Subject name: Gynaecology & Obstetrics
[{'content': 'Mirena is a : \nSelect and explain. \nA. Used in aboions, B. Anti progesterone, C. Progesterone IUCD, D. Hormonal implant', 'role': 'user'}, {'content': 'Answer: C \nExplanation: LNG-IUS or Mirena It is a levanorgestrel releasing device It contains about 52 mg of levonorgestrel released at a rate approximately 20 microgram per day THE TEXTBOOK OF GYNAECOLOGY; SHEILA BALAKRISHNAN; SECOND EDITION; PAGE NO 379.', 'role': 'assistant'}]