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 as a root canal irrigant is 
Select and explain. 
A. Active against gram +ve , gram –ve bacterias and to some extent Virus with lipid envelop., B. Normally used at 2% conc, C. A poly biguinide, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None