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': 'Polymerisation of heat-cured methyl methacrylate is initiated by: \nSelect and explain. \nA. Tertiary amine, B. Benzoyl peroxide free radical, C. Hydroquinone, D. Methyl ether', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]