## **Core Concept**
The question pertains to the identification of the most common type of cataract found in newborns. Cataracts in newborns, also known as congenital cataracts, can be caused by various factors including genetic mutations, infections during pregnancy, and metabolic disorders. Understanding the types of congenital cataracts is crucial for diagnosis and management.

## **Why the Correct Answer is Right**
The correct answer, **C. Congenital nuclear cataract**, is the most common type of cataract found in newborns. Congenital nuclear cataracts affect the central part of the lens, known as the nucleus, and are often associated with genetic factors. They can occur in isolation or as part of a systemic syndrome. The nuclear type is particularly significant because it can cause significant visual impairment if not addressed early in life.

## **Why Each Wrong Option is Incorrect**
- **Option A: Posterior subcapsular cataract** - This type of cataract affects the back of the lens and is more commonly associated with aging, steroid use, or certain diseases, rather than being a common congenital form.
- **Option B: Cortical cataract** - Cortical cataracts affect the lens cortex and are characterized by spoke-like opacities. While they can be congenital, they are not the most common type found in newborns.
- **Option D: Anterior polar cataract** - This type of cataract is located in the front part of the lens and, although it can be congenital, it is less common compared to nuclear cataracts in newborns.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that congenital cataracts, particularly nuclear cataracts, can lead to severe visual impairment or blindness if not treated promptly. Early detection through newborn screening and regular ophthalmological check-ups is crucial for preserving vision.

## **Correct Answer: C. Congenital nuclear cataract**