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
In Co-Cr alloy, function of chromium is to provide 
Select and explain. 
A. Increase in corrosion resistance, B. Increases strength, C. Increased toughness, D. Increase flexibility
A: Increase in corrosion resistance
Answer: A: Increase in corrosion resistance 
Explanation: None