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
After amalgam polishing, the outermost surface has crystals arranged flattened to tooth surface. This layer is known as 
Select and explain. 
A. Beilby layer, B. Beillyl layer, C. Beibyl Layer, D. none of the above
A: Beilby layer
Answer: A: Beilby layer 
Explanation: None