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
Mineralization inhibitors of calculus formation include
all of the following except 
Select and explain. 
A. Triclosan, B. Pyrophosphate, C. Zinc salts, D. Diphosphates
D: Diphosphates
Answer: D: Diphosphates 
Explanation: None