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
Nephrotoxicity of fluoride is: 
Select and explain. 
A. 400-500 μg/dl, B. 800-900 μg/dl, C. 850-950 μg/dl, D. 1000-1200 μg/dl
C: 850-950 μg/dl
Answer: C: 850-950 μg/dl 
Explanation: None