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 weakest phase of the set amalgam: 
Select and explain. 
A. Beta-2, B. Gamma, C. Gamma-1, D. Gamma-2
D: Gamma-2
Answer: D: Gamma-2 
Explanation: None