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
Disorganized molecular surface layer of a highly polished metal produced by a series of abrasives of decreasing coarseness is called as: 
Select and explain. 
A. Hybrid layer, B. Beilby layer, C. Hybroid layer, D. Smear layer
B: Beilby layer
Answer: B: Beilby layer 
Explanation: During the process of polishing, fine scratches and irregularities are filled in by the fine particles being removed from the surface.
This microcrystaline layer is referred to as Polish layer or Beilby layer. This was proposed by Sir George Thomas Beilby.