This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Vitamin A deficiency is characterized by – 
Select and explain. 
A. Bitot spot, B. Xerophthalmia, C. Night blindness, D. All of these
D: All of these
Answer: D: All of these 
Explanation: The most characteristic and specific signs of vitamin A deficiency are eye lesions.
These develop before the age of 2 years.
The term xerophthalmia comprises all the occular manifestations of vitamin A deficiency.

Xerophthalmia (Dry eve) 

It is a syndrome due to deficiency of vitamin A.
It has following stages


Night blindness               -->  Earliest ocular symptom
Conjuctival xerosis         -->      Earliest ocular sign
Bitot's spot
Corneal xerosis
Keratomalacia & corneal ulcers