This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
Keratomalacia (REPEATED question) 
Select and explain. 
A. Occurs due to vitamin A deficiency, B. Relatively benign condition, C. First feature of vitamin A deficiency, D. Also seen in retinitis pigmentosa
A: Occurs due to vitamin A deficiency
Answer: A: Occurs due to vitamin A deficiency 
Explanation: Night blindness is a first feature of Vitamin A deficiency and is also a feature of retinitis pigmentosa Refer: Khurana 6th edition page number 468