**Question:** Not a cause of congenital cataract:

A. Glucose depletion
B. Glucose infusion
C. Glucose overload
D. Glucose toxicity

**Core Concept:** Congenital cataract is a condition characterized by the formation of cataracts in infants or children at birth or in the early years of life. There are various causes of congenital cataract, including genetic and environmental factors. In this context, we need to identify the cause that is not mentioned as a cause of congenital cataract.

**Why the Correct Answer is Right:**

The correct answer, **B. Glucose infusion**, is not a cause of congenital cataract. Glucose infusion is used in neonatal intensive care units (NICUs) to maintain euglycemia in low-birth-weight newborns. However, it does not cause cataract formation.

**Why Each Wrong Option is Incorrect:**

A. **Glucose depletion** can lead to hypoglycemia, which is associated with neurological damage and developmental disorders but not with congenital cataract.

C. **Glucose overload** or **Glucose toxicity** refers to excessive glucose levels causing damage to various tissues and organs. Although glucose toxicity can cause complications like retinopathy, it is not directly associated with congenital cataract.

D. **Glucose toxicity** is a misnomer for glucose toxicity, which refers to adverse effects caused by high glucose levels, not directly related to congenital cataract.

**Clinical Pearl:**

Glucose-related complications in newborns should be distinguished from congenital cataract causes. While maintaining euglycemia is essential for the well-being of low-birth-weight infants, excessive glucose levels or glucose depletion are not directly linked to congenital cataract formation. Instead, focus on genetic and environmental factors as well as specific conditions like galactosemia, which can lead to congenital cataracts.