This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Visual acuity used as cut off for school screening program is \nSelect and explain. \nA. 12-Jun, B. 9-Jun, C. 6-Jun, D. 18-Jun', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Initial screening done by school teachers', 'role': 'assistant'}]