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
10-15% carbamide peroxide degrades into: 
Select and explain. 
A. 7% hydrogen peroxide+ 3% urea, B. 5% hydrogen peroxide+ 5% urea., C. 3% hydrogen peroxide+ 7% urea., D. 4% hydrogen peroxide +6% urea.
C: 3% hydrogen peroxide+ 7% urea.
Answer: C: 3% hydrogen peroxide+ 7% urea. 
Explanation: None