This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
Most immediate treatment of night blindness is - 
Select and explain. 
A. Topical vitamin A, B. Vitamin A orally, C. Vitamin A parentrally, D. None
B: Vitamin A orally
Answer: B: Vitamin A orally 
Explanation: All stages of xerophthalmia can be reversed by administration of massive dose orally on two successive days.