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': 'What is minimum of amount of taper that should be maintained for an ideal tooth preparation? \nSelect and explain. \nA. 4 degree, B. 5 degree, C. 6 degree, D. 12 degree', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]