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
The progestogen with the greatest haemostatic effect used in dysfunctional uterine bleeding (DUB) is : 
Select and explain. 
A. Medroxy progesterone, B. Hydroxy progesterone, C. Norethisterone, D. Dydrogesterone
C: Norethisterone
Answer: C: Norethisterone 
Explanation: Norethisterone