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 culture was contaminated.
B. The culture medium was differential.
C. The incubation temperature was incorrect.
D. The microbiologist used too much inoculum.
E. The culture medium was selective.
Answer: A
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