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
[{'content': 'The quantity of hormone released by Progestase per day is? \nSelect and explain. \nA. 25 ug, B. 45 ug, C. 65 ug, D. 85 ug', 'role': 'user'}, {'content': "Answer: C \nExplanation: Progestase is a commonly used IUCD which carries 38 mg of progesterone in silicone oil reservoir. It releases 65 ug of hormone per day. It acts by forming a thick plug of mucus at the cervical os which prevents penetration by the sperm. Ref: Shaw's Textbook of Gynaecology, 18th edition, p227.", 'role': 'assistant'}]