A microbiologist plated a bacterium on a some medium. After incubation, she noted that the previously yellow medium was now hot pink and there were numerous bacterial colonies of various colors growing on the medium. What type of medium did the microbiologist use in this example?

According to my research on studies conducted by various microbiologists, I can say that based on the information provided within the question the medium being used is called a Differential Medium. This is a bacterial growth media that contains specific ingredients in order to allow the scientists to visually observe and tell the different bacteria apart. Which is how the microbiologist differentiated the bacteria in this situation.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.