Drug a Produces a Certain Therapeutic Effect at a Dose

Drug A produces a certain therapeutic effect at a dose of 5 mg/kg.Drug B produces the same magnitude of effect at a dose of 0.1 mg/kg.How would the nurse describe the action of Drug A when compared to Drug B?

A) Drug A is more efficacious.
B) Drug A is less efficacious.
C) Drug A is more potent.
D) Drug A is less potent.