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
Radius of action of toxins in the bacterial plaque is 
Select and explain. 
A. Less than 2.5 mm, B. Greater than 3.5 mm, C. Less than 1.5 mm, D. 1.5 - 2.5 mm
D: 1.5 - 2.5 mm
Answer: D: 1.5 - 2.5 mm 
Explanation: None