The correct answer is option 'D', which is "Cuboidal epithelium".

Cuboidal epithelium is a type of epithelial tissue that is composed of cube-shaped cells. It is found in various parts of the body, including the proximal convoluted tubule (PCT) of the nephron in the kidney.

The proximal convoluted tubule (PCT) is the first segment of the renal tubule, and it plays a crucial role in reabsorption and secretion. It is responsible for the reabsorption of nutrients, ions, and water from the filtrate back into the bloodstream.

Now, let's discuss why cuboidal epithelium is the correct answer for the epithelium found in the PCT of the nephron:

1. Structure:
- Cuboidal epithelial cells are cube-shaped and have equal height, width, and depth.
- They have a centrally located nucleus.
- The cells are closely packed together, forming a single layer.

2. Function:
- Cuboidal epithelium is well-suited for absorption and secretion due to the presence of microvilli on the apical surface of the cells.
- In the PCT, these microvilli increase the surface area available for reabsorption.
- The cuboidal shape allows for efficient transport of substances across the epithelium.

3. Characteristics:
- Cuboidal epithelium provides mechanical support and protection to the underlying tissues.
- It forms a barrier between the lumen of the tubule and the surrounding tissues.
- The cells are polarized, with distinct apical and basolateral surfaces.

In summary, the epithelium found in the proximal convoluted tubule (PCT) of the nephron in the kidney is cuboidal epithelium. This type of epithelial tissue is well-suited for the reabsorption and secretion functions of the PCT due to its structure, function, and characteristics.

Cuboidal epithelium which helps in absorption...