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
Vulcanization refers to the setting of: 
Select and explain. 
A. Reversible hydrocolloid, B. Mercaptan impression material, C. Zinc phosphate cement, D. Zinc oxide-eugenol
B: Mercaptan impression material
Answer: B: Mercaptan impression material 
Explanation: None