## Core Concept
Trachoma is a chronic keratoconjunctivitis caused by *Chlamydia trachomatis*, leading to corneal and conjunctival inflammation. Corneal signs of trachoma include pannus formation, corneal ulcers, and scarring. Understanding these signs is crucial for diagnosing and managing trachoma.

## Why the Correct Answer is Right
The correct answer, , represents a key corneal sign not associated with trachoma. To determine this, let's evaluate each option in the context of trachoma's corneal manifestations.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is a known corneal sign of trachoma, often presenting as a result of chronic inflammation.
* **Option B:** - This is also associated with trachoma, reflecting the disease's impact on the cornea.
* **Option D:** - Another sign related to trachoma, indicating corneal involvement.

## Clinical Pearl / High-Yield Fact
A key clinical pearl for trachoma is the "WHO trachoma grading system," which helps standardize the assessment of trachoma signs, including corneal and conjunctival features. Recognizing these signs is vital for diagnosing and treating trachoma effectively.

## Correct Answer Line
**Correct Answer: D. Bitot spots**.