**Core Concept**
Gartner's duct cyst is a type of vaginal cyst that originates from remnants of the Wolffian duct, a structure present in the embryo that eventually regresses in females. The Wolffian duct plays a crucial role in the development of the male reproductive system, but in females, it usually disappears. However, in some cases, remnants of the Wolffian duct can persist and give rise to Gartner's duct cysts.

**Why the Correct Answer is Right**
Gartner's duct cysts are believed to arise from the persistence of the Wolffian duct, specifically from the epoophoron, which is a vestigial remnant of the Wolffian duct. These cysts can occur along the anterolateral walls of the vagina and are usually found near the cervix. They are thought to result from the obstruction of the Wolffian duct, leading to the accumulation of secretions and the formation of a cyst.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a structure related to the Wolffian duct or Gartner's duct cysts.
* **Option B:** This option is incorrect because it refers to the paroophoron, a different vestigial remnant of the Wolffian duct that is not directly related to Gartner's duct cysts.
* **Option D:** This option is incorrect because it refers to the mesonephric duct, which is a precursor to the Wolffian duct but not the specific structure that gives rise to Gartner's duct cysts.

**Clinical Pearl / High-Yield Fact**
Gartner's duct cysts are typically benign and can be diagnosed through imaging studies such as ultrasound or MRI. They can cause symptoms such as pelvic pain, vaginal bleeding, or discharge, but most often they are asymptomatic and discovered incidentally during a pelvic exam.

**Correct Answer:** C.