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
Which of the following finish lines is indicated for facial surfaces of metal ceramic restorations 
Select and explain. 
A. Shoulder, B. Chamfer, C. Chisel edge, D. Feather edge
A: Shoulder
Answer: A: Shoulder 
Explanation: None