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
For class V direct filling gold, retention points are 
Select and explain. 
A. In the enamel completely, B. In the occlusal and gingival line angles, C. In the mesial and distal walls, D. In the axial wall completely
B: In the occlusal and gingival line angles
Answer: B: In the occlusal and gingival line angles 
Explanation: None