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
Contamination of zinc-containing amalgam by moisture
during trituration or condensation: 
Select and explain. 
A. Causes a marked expansion, B. Increases the setting time, C. Results in a sharp decrease in flow, D. Has no appreciable effect on amalgam
A: Causes a marked expansion
Answer: A: Causes a marked expansion 
Explanation: None