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': 'Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is: \nSelect and explain. \nA. Molybdenum, B. Germanium, C. Titanium, D. Chromium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]