## **Core Concept**
Koeppe's nodules are a type of inflammatory lesion associated with **uveitis**, specifically in the context of **anterior uveitis** or **iris**. They are characterized by the accumulation of inflammatory cells.

## **Why the Correct Answer is Right**
Koeppe's nodules are indeed **iris nodules** found at the pupillary margin in patients with certain types of uveitis, such as **ankylosing spondylitis**, **reactive arthritis**, and **juvenile idiopathic arthritis**. These nodules are formed due to the aggregation of **epithelioid cells** and **lymphocytes**. They are a sign of active inflammation within the eye.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately describe Koeppe's nodules. Without specific text, we can infer that it likely refers to a different condition or type of nodule.
- **Option B:** Similarly, this option does not correctly identify Koeppe's nodules, possibly confusing them with another type of ocular or systemic condition.
- **Option D:** This option is also incorrect as it does not provide an accurate description or association of Koeppe's nodules.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that Koeppe's nodules are specifically located at the **pupillary margin** of the iris, distinguishing them from **Busacca nodules**, which are found on the surface of the iris. Recognizing the location and associations of Koeppe's nodules can help in diagnosing the underlying cause of uveitis.

## **Correct Answer:** C. Koeppe's nodules.