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
In self-cure acrylic resin, activator is: 
Select and explain. 
A. Toluidine, B. Quaternary ammonium compound, C. Benzoyl peroxide, D. Tertiary amine
D: Tertiary amine
Answer: D: Tertiary amine 
Explanation: None