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
Drugs used in endometriosis are:a) Testosteroneb) Danazolc) GnRHd) Progesteronee) Estrogen 
Select and explain. 
A. abc, B. acd, C. bcd, D. bd
C: bcd
Answer: C: bcd 
Explanation: None