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
Indium in metal are further added to 
Select and explain. 
A. The tarnish resistance of metal, B. Help in corrosion resistance, C. Help in bonding, D. Impart color
C: Help in bonding
Answer: C: Help in bonding 
Explanation: None