**Core Concept:** Retinoblastoma is a rare cancer of the eye in children, caused by mutations in the RB1 gene. It is characterized by the uncontrolled growth and division of retinal cells.

**Why the Correct Answer is Right:**

The correct answer, "C," refers to the fact that retinoblastoma is a rare pediatric cancer resulting from mutations in the RB1 gene. This gene is responsible for regulating cell growth and differentiation, and its mutation leads to uncontrolled cell division and the development of retinoblastoma.

The other options are incorrect for the following reasons:

A. **False:** Retinoblastoma is a pediatric cancer, not typically affecting adults.
B. **False:** Retinoblastoma occurs due to genetic mutations, specifically RB1 gene mutations, not related to vitamin A deficiency.
D. **False:** Retinoblastoma affects both sexes equally, not predominantly affecting females.

**Why Each Wrong Option is Incorrect:**

A. Retinoblastoma is a rare cancer affecting children, not adults. The disease is not typically associated with aging, making option A incorrect.
B. Vitamin A deficiency is not a causative factor for retinoblastoma. Mutations in the RB1 gene are responsible for the development of this cancer, making option B false.
C. Retinoblastoma affects both sexes equally, so the statement that it predominantly affects females is incorrect, making option D false.

**Clinical Pearl:**

Retinoblastoma is a rare but important pediatric oncology case to know. Understanding the genetic basis of the disease and the role of the RB1 gene in regulating cell growth is crucial for diagnosing and managing retinoblastoma cases. Additionally, recognizing that retinoblastoma affects both sexes equally is essential for early detection and treatment.