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': '3rd generation of amalgam contains: \nSelect and explain. \nA. Ag+Sn, B. Ag+Sn+Zn+Cu, C. Ag-Sn+Ag-Cu, D. Alloy+Indium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Generations of Amalgams', 'role': 'assistant'}]