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 is "MOISTURE ACTIVE" adhesive? 
Select and explain. 
A. Cyanoacrylate, B. Methyl methacrylate, C. Bis-GMA, D. All of the above
A: Cyanoacrylate
Answer: A: Cyanoacrylate 
Explanation: None