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
Minimum thickness for type I zinc phosphate cement should be 
Select and explain. 
A. 15 microns, B. 25 microns, C. 50 microns, D. 100 microns
B: 25 microns
Answer: B: 25 microns 
Explanation: None