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
The fluoride concentration of human milk ranges from: 
Select and explain. 
A. 5-10 µg/L, B. 2-8 µg/L, C. 3-12 µg/L, D. 2-10 µg/L
A: 5-10 µg/L
Answer: A: 5-10 µg/L 
Explanation: Fluoride concentration of human milk ranges from 5-10 µg/L. 
These levels are found in nursing mothers living both in non-ﬂuoridated and ﬂuoridated areas. 
Cow's milk contains 30-60 µg/L of ﬂuoride.
Essentials of preventive and community dentistry 
Soben Peter 5th edition