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Which of the following insulin products has the most rapid onset of action, with the option of administering immediately after completing a meal?
A.
Insulin detemir
B.
Insulin glargine
C.
Insulin lispro
D.
Insulin NPH
E.
Insulin regular
Correct Answer C. Insulin lispro
Explanation Insulin lispro is a rapid-acting insulin analog and can be administered within 15 minutes before or immediately after a meal. Insulins glargine, detemir, and NPH are basal insulins, which have onsets of action closer to 1 hour and significantly longer durations of action. Insulin regular is short-acting but with an onset of 30 to 60 minutes; it should be administered 30 minutes before meals.