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
The cavosurface angle for inlay cavity preparation 
Select and explain. 
A. 90 degree, B. 150 degree, C. Less than 90 degree, D. 180 degree
B: 150 degree
Answer: B: 150 degree 
Explanation: None