**Core Concept**
The collecting duct is a crucial part of the nephron in the kidney, responsible for regulating electrolyte and water balance in the body. It is composed of different types of cells that play distinct roles in this process.

**Why the Correct Answer is Right**
The collecting duct contains three main types of cells: principal cells, intercalated cells, and type A and type B cells. Principal cells are responsible for reabsorbing sodium and water, while intercalated cells are involved in acid-base balance through the secretion of hydrogen ions or bicarbonate. Type A and type B cells are also known as alpha- and beta-intercalated cells, which are involved in the secretion of hydrogen ions or potassium ions, respectively. The correct answer will be one of these cell types.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a known cell type found in the collecting duct.
**Option B:** This option is incorrect because it does not accurately describe a cell type found in the collecting duct.
**Option C:** This option is incorrect because it does not accurately describe a cell type found in the collecting duct.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the collecting duct plays a critical role in regulating electrolyte and water balance in the body, and its dysfunction can lead to various kidney disorders, such as nephrogenic diabetes insipidus or renal tubular acidosis.

**Correct Answer:** C. Type A and type B cells.