<prompt> The role of sodium bisulphate in a L.A solution is:Reducing agentAesthetic agentVasoconstrictorPreservative  <response>: Reducing agent Ref: Malamed-4th EdPg 274 Contents of LA caridge: Ingredient Function Local anesthetic agent Lignocaine Conduction blockade Vasoconstrictor adrenalin es absorption of LA anesthesia toxicity Sodium sulphide Antioxidant for vasoconstriction Methyl paraben Preservative Sodium chloride Isotonicity of solution Sterile water Diluent 