## **Core Concept**
Iris pearls are a specific clinical finding associated with certain types of uveitis. They are small, white or yellowish deposits found on the surface of the iris. The formation of iris pearls is related to the migration of epithelial cells from the iris pigment epithelium to the anterior surface of the iris.

## **Why the Correct Answer is Right**
The correct answer, **D.**, is associated with the condition characterized by the formation of iris pearls. Iris pearls are particularly seen in conditions like Fuchs heterochromic iridocyclitis and other forms of nongranulomatous uveitis, but most classically with **leprosy**. In leprosy, iris pearls are formed due to the direct invasion of the iris by *Mycobacterium leprae*, leading to the accumulation of these pearls on the iris surface.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not correspond with the known causes of iris pearls.
- **Option B:** Similarly, this option does not match the conditions associated with iris pearls.
- **Option C:** This is also incorrect as it does not relate to the formation of iris pearls.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that iris pearls are highly suggestive of leprosy when seen in the context of uveitis. Leprosy can cause a range of ocular complications, and the presence of iris pearls is a pathognomonic sign. Early recognition of such signs can lead to the diagnosis of systemic leprosy.

## **Correct Answer:** **D.** Leprosy.