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 percentage of gold in conventional type IV cast gold alloys \nSelect and explain. \nA. 65%, B. 60%, C. 70%, D. 75%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]