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': 'False statement about Mirena is : \nSelect and explain. \nA. Progestrone containing lUCD, B. Contain desogestrol, C. Used in hormone replacement therapy, D. Decreases menstural blood flow', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It is a levanorgestrel releasing device which contains about 52 mg of levanorgestrel released at a rate approximately 20 microgram perday. THE TEXTBOOK OF GYNAECOLOGY SHEILA BALAKRISHNAN SECOND EDITION PAGE NO 379', 'role': 'assistant'}]