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
The unbalanced insulin-dependent diabetes which leads
to accumulation of ketones is associated with one of the following specific character of breath odor/smell 
Select and explain. 
A. Rotten eggs smell, B. Sweet odor, C. Smell of rotten apples, D. Fish odor
C: Smell of rotten apples
Answer: C: Smell of rotten apples 
Explanation: None