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': 'Percentage of gold in high noble alloy is \nSelect and explain. \nA. < 25%, B. 25%, C. >40%, D. 0%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]