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: Dental
[{'content': 'If prevalence of disease is high in population, requires \nSelect and explain. \nA. Low level screening, B. Medium screening, C. High screening, D. No screening', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]