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': 'The screening strategy for prevention of blindness from diabetic retinopathy according to the NPCB involves - \nSelect and explain. \nA. Opportunistic screening, B. High risk screening, C. Mass screening, D. Screening by Primary Care Physician', 'role': 'user'}, {'content': 'Answer: B \nExplanation: High risk screening is applied to the group which has increased risk of developing certain disease/cancer.\nDiabetic retinopathy patients are at increased risk of developing blindness. Therefore, screening strategy for prevention of blindness from diabetic retinopathy is high risk screening.', 'role': 'assistant'}]