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': "Which one of the following is not a target disease under 'Vision 2020: The Right to Sight' \nSelect and explain. \nA. Refractive error, B. Trachoma, C. Corneal blindness, D. Diabetic retinopathy", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `d' i.e., Diebitic retinopathy", 'role': 'assistant'}]