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
[{'content': 'Which of the following is NOT a fully sintered computer aided milling CAM is \nSelect and explain. \nA. Cerec Vitabloc, B. in-denzir, C. bruxzir, D. cercon', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]