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
Occlusal offset in an anterior partial veneer crown may generally be necessary to provide: 
Select and explain. 
A. Retention, B. Conservation of tooth structure, C. Esthetics, D. Structural durability
D: Structural durability
Answer: D: Structural durability 
Explanation: None