<prompt> A patient was given a 160 mg dose of a drug IV, and 80 mg was eliminated during the first 120 minutes. If the drug follows first-order elimination kinetics, how much of the drug will remain 6 hours after its administration?None10 mg20 mg40 mg  <response>: One half of the drug dose is eliminated in 120 min, so its elimination half-life 2 hours. With the passage of each half-life, the amount in the body or in the blood will decrease to 50 of a former level. Thus, at 6 hours after drug administration, the amount of drug remaining is 160 divided by 2x2x2 or 160820mg. 