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 is the weakest phase in amalgam reaction? 
Select and explain. 
A. The voids phase, B. The trace element phase, C. The mercury phase, D. The interphase
C: The mercury phase
Answer: C: The mercury phase 
Explanation: The mercury phase is the weakest phase in the product mass, and when it exceeds a certain volume limit, there will be a drastic drop in the strength and hardness properties of amalgam, in addition to increase in flow and creep of the restoration.
Reference: Marzouk Operative dentistry, pg-106