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
Maintenance of oral health is best achieved by 
Select and explain. 
A. hard bristle tooth brush, B. Mouth wash, C. A soft bristle brush and tooth paste, D. A soft bristle brush and dental floss
D: A soft bristle brush and dental floss
Answer: D: A soft bristle brush and dental floss 
Explanation: None