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
In class II cavity for inlay, the cavosurface margin of the gingival seat clears the adjacent tooth by: 
Select and explain. 
A. 0.20+ 0.05mm, B. 0.50+ 0.20mm, C. 0.80 ± 0.35mm, D. 1.10 ± 0.45mm
B: 0.50+ 0.20mm
Answer: B: 0.50+ 0.20mm 
Explanation: None