An 80 mg dose of a drug was administered to a patient. 40 mg was eliminated during the first hour. This drug follows first-order elimination kinetics.

[Joyce]

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An 80 mg dose of a drug was administered to a patient. 40 mg was eliminated during the first hour. This drug follows first-order elimination kinetics.

Which of the following is the amount of the drug remains 3 hours after administration?

A- 30 mg
B- 20 mg
C- 10 mg
D- None