This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NPCBVI, NACP, Subject name: Social & Preventive Medicine
[{'content': 'Under the School vision screening programme, vision screening in schools is done by: \nSelect and explain. \nA. Ophthalmologist, B. Optometrist, C. NGO worker, D. Teacher', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Under school vision screening programme, Screening is done by class teacher 1 teacher per 150 students Visual acuity cut-off for referral- <6/9 - Comes under secondary level of prevention.', 'role': 'assistant'}]