**Core Concept**
Intrauterine devices (IUDs) are a type of contraceptive that works by releasing hormones or copper ions, which alter the uterine environment to prevent fertilization or implantation of a fertilized egg. They are a popular method of long-term birth control due to their high efficacy and reversibility.

**Why the Correct Answer is Right**
IUDs can be classified into two main categories: hormonal IUDs (e.g., Mirena) and copper IUDs (e.g., ParaGard). Hormonal IUDs work by releasing levonorgestrel, a progestin hormone that thickens cervical mucus and thins the uterine lining, making it difficult for sperm to reach the egg or implantation to occur. Copper IUDs, on the other hand, work by releasing ions that are toxic to sperm, preventing fertilization. The most common types of IUDs are the T-shaped copper IUD (ParaGard) and the levonorgestrel-releasing intrauterine system (Mirena).

**Why Each Wrong Option is Incorrect**
**Option A:** This statement is a true characteristic of IUDs, as they are a type of long-acting reversible contraceptive (LARC) that can be used for up to 10 years.
**Option B:** This statement is also true, as IUDs are a popular method of birth control due to their high efficacy and reversibility.
**Option C:** This statement is true as well, as IUDs can be used to manage heavy menstrual bleeding and pelvic pain.

**Clinical Pearl / High-Yield Fact**
IUDs are a great option for women who want a long-term, reversible form of birth control, but they may not be suitable for women with certain medical conditions, such as pelvic inflammatory disease or uterine anomalies.

**Correct Answer:** D.