Among emergency contraception options, which is described as the most effective and lasts up to 10 years?

• A. Ulipristal acetate (Ella) within 5 days
• B. Levonorgestrel (Plan B) within 3 days
• C. Copper IUD Paragard, most effective, last 10 years
• D. Spermicide gel

Answer: (C)

The main idea is that a copper IUD used as emergency contraception is both the most effective option and the longest-lasting form of contraception. When inserted within about five days after unprotected sex, it provides very high effectiveness at preventing pregnancy, and it also serves as a long-acting reversible contraception that can protect for up to 10 years. This combination—highest initial effectiveness as an emergency method plus a decade of ongoing protection—outweighs the other options, which are pills that must be taken after intercourse and do not offer long-term contraception, or a spermicide gel that is far less effective overall.