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
Machineable glass ceramic is: 
Select and explain. 
A. Cerestore, B. Decor MGC, C. Infusium, D. Leucite
B: Decor MGC
Answer: B: Decor MGC 
Explanation: None