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
Which of the following is present in the powder of the acrylic resin: 
Select and explain. 
A. Methyl methacrylate, B. Benzoyl peroxide, C. Hydroquinone, D. D-methyl paratolouidine
B: Benzoyl peroxide
Answer: B: Benzoyl peroxide 
Explanation: None