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': '10-15% carbamide peroxide degrades into: \nSelect and explain. \nA. 7% hydrogen peroxide+ 3% urea, B. 5% hydrogen peroxide+ 5% urea., C. 3% hydrogen peroxide+ 7% urea., D. 4% hydrogen peroxide +6% urea.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]