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
Initiator for self cure composite is: 
Select and explain. 
A. Tertiary amine., B. Benzoyl peroxide., C. Methyl ether., D. N, N dimethyl paratoludine.
B: Benzoyl peroxide.
Answer: B: Benzoyl peroxide. 
Explanation: None