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
Corrosion in Amalgam cracks can be described as: 
Select and explain. 
A. Wet corrosion, B. Stress corrosion, C. Crevice corrosion, D. Electrolytic corrosion
C: Crevice corrosion
Answer: C: Crevice corrosion 
Explanation: None