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
Which of the following show chemical bond with enamel: 
Select and explain. 
A. Composites, B. Direct filling resins, C. Polycarboxylate cements, D. BIS-GMA resins in pit and fissure sealants
C: Polycarboxylate cements
Answer: C: Polycarboxylate cements 
Explanation: None