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
Initial best sealing of margins is done best by: 
Select and explain. 
A. GIC, B. Acid etched composite, C. Amalgam, D. Polycarboxylate
B: Acid etched composite
Answer: B: Acid etched composite 
Explanation: None