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': 'For maximum benefit, flouride intake should start at: \nSelect and explain. \nA. Birth, B. 2 years, C. 6 years, D. 10 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Early start is required to derive maximum benefits.\nIdeally,\xa0fluoride supplementation should begin shortly after birth and continue through at least age 13.\n\nDHHS Publication No. (NIH). 1981', 'role': 'assistant'}]