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 do polycarboxylate and GIC have in common? 
Select and explain. 
A. Polysiloxane, B. Phosphoric acid, C. Polyacrylic acid, D. Ion leachable glass
C: Polyacrylic acid
Answer: C: Polyacrylic acid 
Explanation: None