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: Social & Preventive Medicine
"Maidon Teeth" is due to: 
Select and explain. 
A. Lead, B. Fluoride, C. Calcium, D. Phosphorus
B: Fluoride
Answer: B: Fluoride 
Explanation: Fluoride