**Core Concept**
The question is testing the knowledge of clinical manifestations of vitamin A deficiency, particularly in children. Vitamin A deficiency can lead to a range of symptoms including night blindness, dry skin, and eye problems.

**Why the Correct Answer is Right**
Vitamin A deficiency is known to cause xerophthalmia, which encompasses a spectrum of eye conditions including night blindness, conjunctival xerosis, corneal xerosis, and ultimately, keratomalacia. The "X3 B" mentioned likely refers to xerophthalmia with corneal involvement, such as keratomalacia, which is a severe and potentially blinding condition if not treated promptly.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because, while it might be related to eye conditions, it does not specifically describe the severe ocular manifestations associated with vitamin A deficiency.
**Option B:** Similarly, this option does not accurately represent the specific eye findings associated with xerophthalmia due to vitamin A deficiency.
**Option C:** This choice is also incorrect as it does not match the clinical description provided in the question stem.

**Clinical Pearl / High-Yield Fact**
Vitamin A deficiency is a significant public health problem in many parts of the world, particularly among children, and can lead to severe visual impairment and blindness if not addressed. Early recognition and treatment of vitamin A deficiency can prevent long-term ocular and systemic complications.

**Correct Answer:** D. Keratomalacia