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
Which of the following does not occur in High Copper Amalgam? 
Select and explain. 
A. Electrochemical Corrosion, B. Chemical Corrosion, C. Penetrating Corrosion, D. Corrosion does not occur at all
C: Penetrating Corrosion
Answer: C: Penetrating Corrosion 
Explanation: None