This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Under NPCB, screening of school children is first done by - \nSelect and explain. \nA. School teachers, B. Village health guide, C. Ophthalmologic assistant, D. Medical officer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Children are being first screened by trained teachers. *Children suspected to have refractive error are seen by ophthalmic assistants and corrective spectacle are prescribed. Ref- Park&;s textbook of Preventive and social medicine 24th edition.', 'role': 'assistant'}]