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
In acrylic restorative materials, the pumping action of alternately imbibing and excluding fluids is termed as: 
Select and explain. 
A. Imbibition, B. Percolation, C. Syneresis, D. Evaporation
B: Percolation
Answer: B: Percolation 
Explanation: None