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
What is the minimal occlusal thickness that will provide resistance to fracture of amalgam: 
Select and explain. 
A. 1.0 mm, B. 1.2 mm, C. 1.5 mm, D. 1.8 mm
C: 1.5 mm
Answer: C: 1.5 mm 
Explanation: None