**Question:** The following statements are true about Intrauterine devices (IUD) except -

A. IUDs can cause ectopic pregnancies
B. IUDs are safe for women with previous pelvic infections
C. IUDs can cause infertility in women
D. IUDs can be used as a first-line contraceptive method in women with previous tubal surgery

**Correct Answer:** A. IUDs can cause ectopic pregnancies

**Core Concept:**
Intrauterine devices (IUDs) are long-acting, reversible contraceptives that are inserted into a woman's uterus to prevent fertilization and conception. IUDs are classified into two main categories: hormonal and non-hormonal (non-hormonal IUDs contain copper). Ectopic pregnancies occur when the fertilized egg implants itself outside the uterus, typically in the fallopian tube. Since IUDs are designed to be located within the uterus, they do not pose a risk for ectopic pregnancies.

**Why the Correct Answer is Right:**
IUDs are designed to prevent fertilization and subsequent implantation in the uterus. When an IUD is correctly placed within the uterus, it creates a hostile environment for sperm and prevents fertilization. Ectopic pregnancies, which occur outside the uterus, are unrelated to IUD use.

**Why Each Wrong Option is Incorrect:**
A. IUDs do not cause ectopic pregnancies.
B. Women with previous pelvic infections may use IUDs as a first-line contraceptive method; however, the statement is not entirely incorrect, but the focus here is on the concept of ectopic pregnancies and IUDs.
C. Ectopic pregnancies can occur due to tubal damage, but the statement is not directly related to IUDs.
D. IUDs can be used as a first-line contraceptive method in women with previous tubal surgery, which is a correct use of IUDs but does not address the concept of ectopic pregnancies.

**Clinical Pearl:**
When counseling patients about contraceptive options, it is essential to emphasize the safety profile of IUDs, including their low risk for ectopic pregnancies, which is a critical complication to prevent. Although IUDs can be used in specific patient populations like those with previous tubal surgery or pelvic infections, focusing on ectopic pregnancies helps to emphasize the primary benefit and safety aspect of IUDs.