This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Community Ophthalmology, Subject name: Ophthalmology
[{'content': 'Visual cut off for referral to nearest PHC? \nSelect and explain. \nA. <6/9 in either eye, B. <6/12 in either eye, C. <6/9 in both eye, D. none of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Visual cut off for referral to nearest PHC: <6/9 in either eye. Screening is done by school teachers. Female teachers are preferred. Focus on middle school(5-8th) covering 10-14 years age. 1,50,000 children to be screened per block One trained teacher to handle 150 students 1- day training for the teacher at nearest PHC Teacher Kit: Vision screening cards, referral cards, tape/rope to measure 20 feet', 'role': 'assistant'}]