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 finish line used in complete metal cast crown is: 
Select and explain. 
A. Chamfer, B. Chafer with bevel, C. Feather edge, D. Shoulder
A: Chamfer
Answer: A: Chamfer 
Explanation: None