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 carbohydrate not associated with dental plaque is: 
Select and explain. 
A. Dextrose, B. Levans, C. Glucose, D. Rhamnose
D: Rhamnose
Answer: D: Rhamnose 
Explanation: None