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
For greatest retention of the porcelain veneer, the coping design should be 
Select and explain. 
A. Convex with undercuts, B. Convex with no undercuts, C. Convex with sharp angles, D. Concave on facial surface
B: Convex with no undercuts
Answer: B: Convex with no undercuts 
Explanation: None