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: Social & Preventive Medicine
[{'content': 'A mother brought her six years old child to Eye OPD with history of night blindness. She told that the baby suffered from measles 6 months ago. Examination revealed corneal scarring. The doctor should suspect deficiency of \nSelect and explain. \nA. Vitamin A, B. Vitamin D, C. Vitamin C, D. Vitamin B', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]