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
Marginal metal angle for cast inlay is: 
Select and explain. 
A. 130-140 degree, B. 30-40 degree, C. 90-100 degree, D. Less than 30 degree
B: 30-40 degree
Answer: B: 30-40 degree 
Explanation: DIFFERENES  BETWEEN INLAY AND AMALGAM RESTORATIONS: