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 fluoride concentration of community water is___________ppm, no need of any flouride supplement at any stage. \nSelect and explain. \nA. >1 ppm, B. >0.7 ppm, C. >2 ppm, D. >1.5 ppm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Supplemental fluoride depends on the\xa0age\xa0of child and F- level in water.\nBelow 4 years, fluoridated dentifrices are not recommended\nBelow 2 years, F- tablets are not recommended.\nBelow 6 years, F- mouthwash is not recommended.\nIf F- concentration of community water is >0.7 ppm, no\xa0need of any F- supplement at any age.\n\nEssentials of preventive and community dentistry\xa0\nSoben Peter\xa0\n5th edition', 'role': 'assistant'}]