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
The setting reaction of dental amalgam proceeds primarily by _____. 
Select and explain. 
A. Dissolution of the entire alloy particle into mercury., B. Dissolution of the Cu from the particles into mercury., C. Precipitation of Sn-Hg crystals., D. Mercury reaction with Ag on or in the alloy particle.
D: Mercury reaction with Ag on or in the alloy particle.
Answer: D: Mercury reaction with Ag on or in the alloy particle. 
Explanation: The trituration process mixes the amalgam components and the reaction results in the alloy particle being coated by mercury and a product being formed.