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
[{'content': 'Keratomalacia is - \nSelect and explain. \nA. Occurs due to Vit-A deficiency, B. Relatively benign condition, C. First feature of Vit- A deficiency, D. Also seen in retinitis pigmentosa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Keratomalacia is due to deficiency of vitamin A.\nIt is not relatively benign. Larger stromal defects in keratomalacia commonly result in blindness.\nEarliest symptom is nightblindness and earliest sign is conjunctival xerosis.\nRetinitis pigmentosa does not cause keratomalacia.', 'role': 'assistant'}]