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: Social & Preventive Medicine
Earliest feature of vitamin-A deficiency is: 
Select and explain. 
A. Dryness of conjunctiva, B. Nyctalopia, C. Keratomalacia, D. Hyphema
A: Dryness of conjunctiva
Answer: A: Dryness of conjunctiva 
Explanation: Dryness of conjunctiva