## Core Concept
Emergency contraception refers to methods used to prevent pregnancy after unprotected sex or contraceptive failure. Various hormonal and non-hormonal options are available, including levonorgestrel, ulipristal acetate, and copper intrauterine devices (IUDs).

## Why the Correct Answer is Right
is a type of progestin used in some contraceptive pills and is effective as an emergency contraceptive when given in a specific dose. and are also recognized for their use in emergency contraception. However, is not typically used for emergency contraception; instead, it's used for inducing ovulation in women with anovulatory disorders.

## Why Each Wrong Option is Incorrect
* **Option A:** can be used for emergency contraception, particularly when administered in a specific regimen.
* **Option B:** is known for its efficacy in emergency contraception, especially when timing is a concern.
* **Option D:** is a copper IUD, which can be used as emergency contraception if inserted within a certain timeframe after unprotected sex.

## Clinical Pearl / High-Yield Fact
A key point to remember is that emergency contraception is most effective when used promptly after unprotected sex. The copper IUD can provide ongoing contraception if left in place.

## Correct Answer: .