###Rationale: Keratomalacia is due to vitamin A deficiency.

"Vitamin A deficiency is the most common cause of blindness in children in India". __ Philip Reily
"Vitamin A deficiency is the single most important cause of blindness in children". — Wykoff

###Answer: OPTION A IS CORRECT.
###Question: Blindness in a child is most commonly due to -
###Options:
A. Keratomalacia
B. Congenital cataract
C. Glaucoma
D. Injuries
