Which Drugs Will Not Be Affected by Interpatient Variability

Which drugs will not be affected by interpatient variability?

A) Antiseptics applied to the skin to slow bacterial growth
B) Antacids to help with the discomfort of heartburn
C) Broad-spectrum antibiotics that are effective against many organisms
D) Chelating agents that remove metal compounds from the body
E) Topical analgesics used to treat localized pain