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
Angle at gingival bevel in class II inlay cavity 
Select and explain. 
A. 30°, B. 10°, C. 5°, D. 50°
A: 30°
Answer: A: 30° 
Explanation: None