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
[{'content': 'Most immediate treatment of night blindness is - \nSelect and explain. \nA. Topical vitamin A, B. Vitamin A orally, C. Vitamin A parentrally, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: All stages of xerophthalmia can be reversed by administration of massive dose orally on two successive days.', 'role': 'assistant'}]