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
[{'content': 'In acrylic restorative materials, the pumping action of alternately imbibing and excluding fluids is termed as: \nSelect and explain. \nA. Imbibition, B. Percolation, C. Syneresis, D. Evaporation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]