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': 'Carbamide solution used for bleaching degrades into \nSelect and explain. \nA. 0.3% sodium perborate, B. 30% hydrogen peroxide, C. 3% hydrogen peroxide, D. 30% sodium perborate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]