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
The quantity of hormone released by Progestase per day is? 
Select and explain. 
A. 25 ug, B. 45 ug, C. 65 ug, D. 85 ug
C: 65 ug
Answer: C: 65 ug 
Explanation: 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.