This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health programmes in India, 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: B \nExplanation: Vision 2020 The Right to Sight Target diseases are cataract, refractive errors, childhood blindness, corneal blindness, glaucoma, diabetic retinopathy. Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition pg 440', 'role': 'assistant'}]