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
Functional Cusp Bevel is given for: 
Select and explain. 
A. Marginal integrity, B. Structural durability, C. Retention and resistance form, D. To improve the geometry of tooth surface
B: Structural durability
Answer: B: Structural durability 
Explanation: None