A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?
A. The microbiologist used too much inoculum.
B. The incubation temperature was incorrect.
C. The culture medium must be selective.
D. The culture is contaminated.
E. The culture medium must be differential.
Answer: D
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