**Core Concept:**
Galactosemia is a group of genetic disorders characterized by the accumulation of galactose or its compounds in the body, caused by defects in the enzymes involved in galactose catabolism. Galactose is a sugar found in galactose-rich foods like lactose, and its catabolism involves multiple enzymes and pathways.

**Why the Correct Answer is Right:**
The correct answer, **"C. Lenticular sclerosis"**, refers to the pathological process in the lens of the eye that leads to the characteristic cataract seen in individuals with galactosemia. Lenticular sclerosis is a hardening and thickening of the lens due to the accumulation of galactose and its compounds, which impairs the transparency of the lens and results in a cataract.

**Why Each Wrong Option is Incorrect:**

A. **"Irregular lens fibers"**: This option is incorrect because it describes the structural abnormality in the lens due to galactosemia, not the type of cataract. Lenticular sclerosis is the correct answer that explains the functional consequence of this structural abnormality.

B. **"Galactose-induced protein glycation"**: While galactose can undergo glycation, this option is incorrect because it only explains one aspect of the pathophysiology but does not address the type of cataract. Lenticular sclerosis is the more comprehensive answer that captures the overall effect of galactose accumulation on the lens.

D. **"Galactosemia"**: This option is incorrect because it refers to the disease itself, not the type of cataract associated with it. Lenticular sclerosis is the correct answer that describes the specific type of cataract caused by galactose accumulation.

**Clinical Pearl:**

Galactosemia is a rare genetic disorder that can lead to various long-term complications, including cataracts. Early diagnosis and management are essential to prevent or minimize these complications. Lenticular sclerosis is the key pathological process responsible for the characteristic cataract seen in individuals with galactosemia.