A 65-Year-Old Homeless Male Presents to an Urgent Care Clinic

A 65-year-old homeless male presents to an urgent care clinic with a deep laceration on his left arm. He states that he cut his arm on an old piece of scrap metal two days prior. His wound is red, tender, hot to the touch, and has yellow drainage. The RN collects a sample of the drainage and sends it to the laboratory for microbial analysis, per provider orders.
-The patient's culture results positive for Staphylococcus.The RN understands that the culture most likely required growth on a complex medium,consisting of 

A) an exact chemical formula.
B) chemical growth inhibitors.
C) at least one ingredient that is not chemically defined.
D) None of the choices are correct.