**Core Concept**
The lens capsule is a transparent, elastic structure surrounding the lens in the eye, composed of a basement membrane and a layer of epithelial cells. The lens capsule plays a crucial role in maintaining the shape and transparency of the lens, and its thickness varies in different regions.

**Why the Correct Answer is Right**
The posterior epithelium of the lens in postnatal life is not made up of cuboidal epithelium. Instead, it is composed of a single layer of flat, plate-like cells known as lens fiber cells. These cells are produced by the anterior epithelium and migrate posteriorly to form the lens fibers, which make up the bulk of the lens. The posterior epithelium itself is not present in postnatal life, as it is replaced by the lens fiber cells.

**Why Each Wrong Option is Incorrect**
**Option A:** The pre-equatorial region of the lens capsule is indeed the thickest part, measuring around 22-23 μm, which helps to maintain the shape of the lens.

**Option B:** The anterior epithelium of the lens is indeed made up of a single layer of cuboidal cells, which are responsible for producing lens fiber cells.

**Option D:** Relative dehydration in the cortex is indeed due to the action of the Na+ – K+ ATPase pump, which helps to maintain the proper balance of ions and water in the lens.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the lens capsule is a dynamic structure that changes throughout life, and its thickness and composition can be affected by various factors, including age, disease, and trauma.

**Correct Answer:**
✓ Correct Answer: C. Posterior epithelium in postnatal life is made up of Cuboidal epithelium