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 formed in cast metal restorations is 
Select and explain. 
A. 90 degree; Butt joint, B. 130-140 degree; Lap sliding fit, C. 130-140 degree; Butt joint, D. 90 degree; Lap sliding fit
B: 130-140 degree; Lap sliding fit
Answer: B: 130-140 degree; Lap sliding fit 
Explanation: None