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
Salvizol is a root canal irrigants with composition: 
Select and explain. 
A. N1- decamethylene-bis-4aminoquinaldinium-dia-cerate., B. bis-dequalinium acetate., C. 4-chlorophenyl rings., D. None.
A: N1- decamethylene-bis-4aminoquinaldinium-dia-cerate.
Answer: A: N1- decamethylene-bis-4aminoquinaldinium-dia-cerate. 
Explanation: SALVIZOL
Salvizol is a detergent suggested for irrigating root canals during instrumentation. It is a root canal chelating irrigant, N1-decamethylene-bis-4-aminoquinaldinium-diacetate. Kaufman et al, has showe that salvizol, with a neutral pH level has a broad spectrum of bactericidal.