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 phase is small and equiaxed: 
Select and explain. 
A. Gamma1 phase., B. Gamma 2 phase., C. Residual phase., D. All of the above.
A: Gamma1 phase.
Answer: A: Gamma1 phase. 
Explanation: None