## Core Concept
Alder-Reilly bodies are characteristic inclusions found in certain types of cells, particularly in lysosomal storage diseases. They are composed of accumulated mucopolysaccharides. The presence of these bodies is a diagnostic clue for specific metabolic disorders.

## Why the Correct Answer is Right
Alder-Reilly bodies are specifically associated with **mucopolysaccharidosis**, a group of metabolic disorders caused by the deficiency of enzymes needed to degrade and recycle sugar molecules. These bodies are visible under a microscope as coarse, purple-staining granules within the cytoplasm of cells, particularly in lymphocytes. Their presence aids in the diagnosis of conditions like Hurler syndrome and Hunter syndrome, which are types of mucopolysaccharidosis.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because Alder-Reilly bodies are not typically associated with this condition.
- **Option B:** This option is incorrect as it does not directly relate to the known associations of Alder-Reilly bodies.
- **Option C:** This is the correct answer but let's evaluate the rest.
- **Option D:** This option is incorrect because it does not accurately represent the condition associated with Alder-Reilly bodies.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that Alder-Reilly bodies can be seen in conditions like **Hurler syndrome (MPS I)** and **Hunter syndrome (MPS II)**, which are lysosomal storage diseases. The presence of these bodies in lymphocytes is a diagnostic clue that can guide further testing and management.

## Correct Answer Line
**Correct Answer: C.**