## **Core Concept**
The question pertains to the ocular manifestations associated with chromosomal abnormalities, specifically deletions or anomalies involving chromosome 13. Chromosomal abnormalities can lead to various congenital anomalies, including ocular manifestations.

## **Why the Correct Answer is Right**
The correct answer, **D. Retinoblastoma**, is associated with a deletion on chromosome 13 (13q14). Retinoblastoma is a malignant tumor of the retina that primarily affects young children. It is known to be linked with mutations in the RB1 gene located on chromosome 13q14. This gene acts as a tumor suppressor, and its mutation or deletion can lead to the development of retinoblastoma.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might include other ocular conditions not specifically linked to chromosome 13 abnormalities.
- **Option B:** This option is not provided, but similarly, it would represent an incorrect association.
- **Option C:** This option is not provided. However, for the sake of completeness, other ocular manifestations might be associated with different chromosomal abnormalities but not specifically with chromosome 13.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **Retinoblastoma is associated with a higher risk of second primary malignancies**, especially in individuals with the hereditary form of the disease. This is directly related to the germline mutation in the RB1 gene on chromosome 13.

## **Correct Answer: D. Retinoblastoma**