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': 'Advantages of complete veneer crown include all of the above except: \nSelect and explain. \nA. Most effective retention and resistance., B. Alteration in tooth form and occlusion possible., C. Margins are close to gingiva., D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Advantages of complete veneer crown\n\nMost eﬀective retention and resistance.\nAlteration in tooth form and occlusion possible.\n\nDisadvantages of complete veneer crown\n\nExtensive tooth preparation.\nMargins are close to gingiva and need meticulous maintenance.', 'role': 'assistant'}]