MCSA the Nurse Is Preparing Xylocaine That the Physician Will

MCSA The nurse is preparing xylocaine that the physician will use for local anaesthesia before suturing a large hand laceration. The nursing student asks whether the client will need another injection of the local anaesthesia. The nurse responds that it is usually not necessary. What is the best explanation by the nurse?

A) "Epinephrine added to the local prolongs the effect of the drug by vasoconstriction of the blood vessels."
B) "Adding a topical anaesthetic to the hand before the local is injected will prolong the local's effect."
C) "The addition of sodium hydroxide to the anaesthetic will prolong the effects of the local by 20-40 minutes."
D) "Local anaesthetics have a half life of about 3 hours, there is no worries that the local will not be effective while the physician completes his suturing."