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 base metal alloys, corrosion resistance occurs due to 
Select and explain. 
A. Passivity, B. High fusion temperature, C. High molecular weight, D. Co-efficient of thermal expansion
A: Passivity
Answer: A: Passivity 
Explanation: None