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
[{'content': 'The progestogen with the greatest haemostatic effect used in dysfunctional uterine bleeding (DUB) is : \nSelect and explain. \nA. Medroxy progesterone, B. Hydroxy progesterone, C. Norethisterone, D. Dydrogesterone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Norethisterone', 'role': 'assistant'}]