## Core Concept
Schwalbe's line is an anatomical landmark in the cornea, specifically related to its layers. The cornea is composed of several layers, and understanding the peripheral limits of these layers is crucial for ophthalmological examinations and surgeries.

## Why the Correct Answer is Right
The correct answer, Descemet's membrane, is a layer of the cornea produced by the corneal endothelium. Schwalbe's line marks the peripheral limit of Descemet's membrane. It is an important landmark in gonioscopy, which is used to examine the anterior chamber angle. Schwalbe's line is essentially the termination of Descemet's membrane at the limbus, the border between the cornea and the sclera.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because the stroma is the thickest layer of the cornea but does not have a distinct peripheral limit marked by Schwalbe's line.
* **Option B:** This option is incorrect as it refers to another layer but does not accurately represent the layer associated with Schwalbe's line.
* **Option D:** This option is incorrect because, while the epithelium is a layer of the cornea, Schwalbe's line does not mark its peripheral limit.

## Clinical Pearl / High-Yield Fact
A key clinical correlation is that Schwalbe's line is critical in the assessment of the anterior chamber angle, particularly in diagnosing and managing conditions like congenital glaucoma. Its identification is essential for ophthalmologists, especially during gonioscopic examinations.

## Correct Answer: C. Descemet's membrane.