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 effectiveness of condensing porcelain powder to
reduce shrinkage is determined by 
Select and explain. 
A. Shape and size of the particle, B. Thickness of the platinum matrix, C. Speed of increase of furnace heat, D. Using powder of same particle size
A: Shape and size of the particle
Answer: A: Shape and size of the particle 
Explanation: None