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': 'The percentage of unconsumed alloy in low copper amalgams is: \nSelect and explain. \nA. 20, B. 9.2, C. 8.8, D. 10', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]