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 restoration which shows percolation and shrinkage along the margin is: 
Select and explain. 
A. Composites, B. Unfilled resins, C. Amalgam, D. Polycarboxylate
B: Unfilled resins
Answer: B: Unfilled resins 
Explanation: None