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': 'Current concepts of "evaluating health care" require a scientific basis for treatment referred as: \nSelect and explain. \nA. Evidence based therapy, B. Periodontal maintenance, C. Tooth mortality, D. Prevention of loss of attachment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]