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 first layer of porcelain applied on to a metal in PFM crowns would be 
Select and explain. 
A. Opaque, B. Body, C. Incisal, D. Both 1 and 2
A: Opaque
Answer: A: Opaque 
Explanation: None