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
[{'content': 'Which of the following is present in the powder of the acrylic resin: \nSelect and explain. \nA. Methyl methacrylate, B. Benzoyl peroxide, C. Hydroquinone, D. D-methyl paratolouidine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]