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 fluoride concentration of human milk ranges from: \nSelect and explain. \nA. 5-10 µg/L, B. 2-8 µg/L, C. 3-12 µg/L, D. 2-10 µg/L', 'role': 'user'}, {'content': "Answer: A \nExplanation: Fluoride concentration of human milk ranges from 5-10 µg/L.\xa0\nThese levels are found in nursing\xa0mothers living both in non-ﬂuoridated and ﬂuoridated areas.\xa0\nCow's milk contains 30-60 µg/L of ﬂuoride.\nEssentials of preventive and community dentistry\xa0\nSoben Peter 5th edition", 'role': 'assistant'}]