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 is NOT a fully sintered computer aided milling CAM is 
Select and explain. 
A. Cerec Vitabloc, B. in-denzir, C. bruxzir, D. cercon
D: cercon
Answer: D: cercon 
Explanation: None