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: Biochemistry
Xylitol is a 
Select and explain. 
A. Natural sweet amino acid, B. Synthetic sweet amino acid, C. Natural five carbon sugar, D. Synthetic five carbon sugar
C: Natural five carbon sugar
Answer: C: Natural five carbon sugar 
Explanation: None