This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malnutrition, Subject name: Pediatrics
First clinical sign of vitamin A deficiency: 
Select and explain. 
A. Poor growth, B. Conjunctival xerosis, C. Hydrocephalus, D. Phrynoderma
B: Conjunctival xerosis
Answer: B: Conjunctival xerosis 
Explanation: First clinical sign of vitamin A deficiency is conjunctival xerosis, while 1st symptom is night blindness.