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
[{'content': 'Corrosion in Amalgam cracks can be described as: \nSelect and explain. \nA. Wet corrosion, B. Stress corrosion, C. Crevice corrosion, D. Electrolytic corrosion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]