## **Core Concept**
Gartner's duct cysts are benign, congenital anomalies that arise from the remnants of the **mesonephric ducts** (also known as Wolffian ducts) in the female genital tract. These ducts typically regress during embryonic development but can leave behind remnants that may form cysts.

## **Why the Correct Answer is Right**
The correct answer, **D.**, indicates that Gartner's duct cysts are seen in the **vagina**. This is accurate because Gartner's duct cysts most commonly occur in the vagina, along the lateral walls, as a result of the incomplete regression of the mesonephric ducts during fetal development. These cysts can also occasionally be found in the **labia majora** and **vulva**, but the vagina is the most typical location.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because Gartner's duct cysts are not typically associated with the **ovaries**. The ovaries develop from the **genital ridge** and are not directly related to the mesonephric ducts.
- **Option B:** This option is incorrect because Gartner's duct cysts are not commonly found in the **cervix**. While the mesonephric ducts are close to the developing female genital tract, including the cervix, cysts are much more frequently identified in the vagina.
- **Option C:** This option is incorrect because Gartner's duct cysts are not typically located in the **broad ligament**. The broad ligament is a fold of peritoneum that attaches the uterus, fallopian tubes, and ovaries to the pelvis, but it is not a common site for Gartner's duct cysts.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that Gartner's duct cysts are usually **asymptomatic** but can become apparent due to **vaginal wall swelling** or may be discovered incidentally during a **pelvic examination**. They are often lined by **cuboidal or columnar epithelium**, which can sometimes be ciliated.

## **Correct Answer:** D. vagina.