This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
All are true regarding medical treatment of endometriosis except? 
Select and explain. 
A. Oral progestins cause decidualization of endometrial tissue, B. Injectable progestagen is used once in 3 months in the management of pain of endometriosis, C. Levonorgestrel releasing intrauterine system reduces dysmenorrhoea in endometriosis, D. Gestrinone is given orally 2.5 - 5 mg per day to induce endometrial atrophy
D: Gestrinone is given orally 2.5 - 5 mg per day to induce endometrial atrophy
Answer: D: Gestrinone is given orally 2.5 - 5 mg per day to induce endometrial atrophy 
Explanation: Gestrinone has a long half life. It is a 19-noestosterone derivative. It is given orally 2.5 to 5 mg twice weekly for 6 to 9 months. It has androgenic, antiprogestagenic, antioestrogenic and antigonadotrophic action. Ref : Shaw's Textbook of Gynaecology