**Core Concept**
Rushton bodies are small, spherical, hyaline structures found within the epithelial lining of certain odontogenic cysts. These bodies are composed of concentrically laminated material and are a characteristic feature of certain cystic lesions.

**Why the Correct Answer is Right**
Rushton bodies are indeed associated with odontogenic cysts, specifically the radicular cysts and the dentigerous cysts. However, they are most prominently found in the radicular cysts. The presence of Rushton bodies is often used as a diagnostic clue in the histopathological examination of these cystic lesions. The exact composition and function of Rushton bodies are not well understood, but they are believed to be a product of the degeneration of the epithelial lining of the cyst.

**Why Each Wrong Option is Incorrect**
**Option B:** Refractile bodies are actually seen in the radicular cysts, but refractile bodies are different from Rushton bodies. Refractile bodies are larger and more irregular in shape, and their presence is also used as a diagnostic feature of radicular cysts.
**Option C:** Ameloblastomas are a type of odontogenic tumor, not a cystic lesion, and Rushton bodies are not typically found in these tumors.
**Option D:** Dentigerous cysts do contain hyaline bodies, but these are different from Rushton bodies. The hyaline bodies found in dentigerous cysts are often referred to as "hyaline masses" or "hyaline globules".

**Clinical Pearl / High-Yield Fact**
Rushton bodies can be a useful diagnostic feature in the histopathological examination of odontogenic cysts, particularly radicular cysts. However, it's essential to note that the presence of Rushton bodies does not necessarily confirm the diagnosis of a radicular cyst, and other diagnostic features must be considered in conjunction with the histopathological findings.

**✓ Correct Answer: A. Hyaline bodies of odontogenic cyst**