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': 'Vision 2020 include all of the following, Except ? \nSelect and explain. \nA. Cataract, B. Refractory Errors, C. Vitamin A Deficiency, D. Diabetic Retinopathn', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is ' c' i.e., Vitamin A Deficiency", 'role': 'assistant'}]