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
Mercapton groups are seen in 
Select and explain. 
A. Polysulphide, B. Addition silicone, C. Condensation silicone, D. Polyether
A: Polysulphide
Answer: A: Polysulphide 
Explanation: None