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': 'Indium in metal are further added to \nSelect and explain. \nA. The tarnish resistance of metal, B. Help in corrosion resistance, C. Help in bonding, D. Impart color', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]