Erik presents with one golden-crusted lesion at the site of an insect bite consistent with impetigo. Which medication would be the best choice for treatment?

Erik presents with one golden-crusted lesion at the site of an insect bite consistent with impetigo. His parents have limited finances and request the least expensive treatment. Which medication would be the best choice for treatment? (Points : 1)       Retapamulin (Altabax)       Mupirocin (Bactroban)       Bacitracin and polymixin B (generic double antibiotic ointment)       Oral cephalexin (Keflex)