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
Cerestore is: 
Select and explain. 
A. Machinable glass ceramic, B. Shrink free ceramic, C. Castable ceramic, D. Injection ceramic
B: Shrink free ceramic
Answer: B: Shrink free ceramic 
Explanation: None