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 elastomer having the longest curing time is 
Select and explain. 
A. Polysulfide, B. Poly ether, C. Addition silicone, D. Condensation silicone
A: Polysulfide
Answer: A: Polysulfide 
Explanation: None