This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Natural Methods, Barrier Methods, IUDs, OCPs, Subject name: Social & Preventive Medicine
The highest incidence of ectopic pregnancy amongst contraceptive users is observed with: 
Select and explain. 
A. Combined contraceptive pills, B. Copper T intrauterine contraceptive device, C. Progestase intrauterine device, D. Levonorgestrel intrauterine system
C: Progestase intrauterine device
Answer: C: Progestase intrauterine device 
Explanation: - There is a slight increase in propoion of ectopic pregnancy post-failure of IUCD. The failure is highest with progesterone IUD. Progestase intrauterine device: - Rate of progesteron release = 65 mcg/day - Total progesteron content = 38mg - Shelf life = 1 to yrs - MC side effect is bleeding - 2nd MC side effect - pain