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
Fluorides facilitates the precipitation into tooth structure of fluorapatite from calcium and phosphate ions present in saliva, replacing the following 
Select and explain. 
A. Soluble salts containing manganese only, B. Soluble salts containing manganese and carbonate, C. Soluble salts containing carbonate only, D. Soluble salts of sodium
B: Soluble salts containing manganese and carbonate
Answer: B: Soluble salts containing manganese and carbonate 
Explanation: None