**Core Concept:** Cataract is a condition characterized by the clouding of the lens in the eye, leading to a decrease in vision. Radiation-induced injury can cause cataract formation due to damage to the lens cells and proteins, leading to impaired light transmission.

**Why the Correct Answer is Right:** Cataract is primarily seen in the **Capsular Body (CB)** of the lens. The capsule is a fibrous capsule surrounding the lens, and its integrity is crucial for maintaining clear vision. Radiation-induced injury affects the lens cells and proteins, causing them to aggregate and form a cloudy mass within the capsular body, resulting in cataract formation.

**Why Each Wrong Option is Incorrect:**

A. **Cortical Lens**: This option refers to the outer layer of the lens, which is not the primary site affected by radiation-induced injury leading to cataract formation.
B. **Ciliary Body**: The ciliary body is an integral part of the uveal tract and is responsible for the production of aqueous humor. It is not the site where radiation-induced injury causes cataract formation.
C. **Central Lens**: The central lens is a part of the lens, but it is not the specific region affected by radiation-induced injury leading to cataract formation. The capsular body is the primary site.
D. **Fibroblasts**: While fibroblasts are involved in lens capsule formation, the correct answer focuses on the capsular body, not fibroblasts.

**Clinical Pearl:** Understanding the specific region affected by radiation-induced injury is crucial for early recognition and management of radiation-induced cataracts. Radiation-induced cataracts are preventable by appropriate radiation shielding and monitoring of patients at risk.

**Correct Answer:** Capsular Body (CB)