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 most effective contraceptive available is: 
Select and explain. 
A. Combined Oral contraceptive pill, B. Progestin injectable, C. Third generation IUCD, D. Centchroman
C: Third generation IUCD
Answer: C: Third generation IUCD 
Explanation: - Amongst the choices, third generation is most effective with a failure rate of only 0.2/HWY. PEARL INDEX OF DIFFERENT CONTRACEPTIONS: Male condoms 2-14 / HWY Female condoms 5-21 / HWY Centchroman 1.84 - 2.84 /HWY OCPs 0.1 - 2 /HWY Sterilization 0.1 / HWY Vaginal sponge 9-20 / HWY