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
Chlorhexidine gluconate is used as a mouth wash in a concentration of 
Select and explain. 
A. 0.20%, B. 20%, C. 2.00%, D. None of the above
A: 0.20%
Answer: A: 0.20% 
Explanation: None