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: Ophthalmology
Earliest feature of xerophthalmia is 
Select and explain. 
A. Conjunctival xerosis, B. Bitot spots, C. Dry eye, D. Night blindness
D: Night blindness
Answer: D: Night blindness 
Explanation: Earliest - Night blindness.