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': "The world health organization's objective in dental health is that by the year 2000 a person, at age of 12, shall not have decayed, missing and filled teeth (DMF) more than: \nSelect and explain. \nA. 1, B. 2, C. 3, D. 4", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]