**Core Concept**
Hurler's disease, also known as mucopolysaccharidosis type I (MPS I), is a genetic disorder caused by a deficiency of the enzyme alpha-L-iduronidase (IDUA). This enzyme is necessary for the breakdown of sugar molecules, specifically dermatan sulfate and heparan sulfate. The accumulation of these molecules in cells and tissues leads to the development of various clinical manifestations.

**Why the Correct Answer is Right**
Reilly bodies are intracellular inclusions seen in the lysosomes of cells from individuals with Hurler's disease. These inclusions are composed of accumulated mucopolysaccharides, which are the result of the enzyme deficiency. The presence of Reilly bodies is a characteristic histopathological feature of Hurler's disease and can be used as a diagnostic marker.

**Why Each Wrong Option is Incorrect**
**Option A:** Reilly bodies are not associated with other lysosomal storage diseases, such as Tay-Sachs disease or Pompe disease. Those diseases have distinct histopathological features.
**Option B:** Reilly bodies are not typically seen in non-lysosomal storage diseases, such as muscular dystrophy or neurodegenerative disorders. Those conditions have different underlying pathologies.
**Option C:** Reilly bodies are not found in normal cells or tissues, as they are a result of the enzyme deficiency in Hurler's disease.

**Clinical Pearl / High-Yield Fact**
Reilly bodies are a specific type of inclusion body that can be used as a diagnostic marker for Hurler's disease. They are a result of the accumulation of mucopolysaccharides in lysosomes, which is a hallmark of this condition.

**Correct Answer:** C.