If you have a patient stool sample and want to test it for pathogens, you would use a MacConkey plate. Option D is correct.
An agar plate is a petri dish used to cultivate bacteria. Most of these plates have growth mediums used to promote bacterial growth to allow further study. Each kind of plate is unique in the additives it has and the function they offer. Some contain dyes to detect certain organisms or substances while others contain antibiotics or inhibitors to control growth.
The mannitol salt plate is used to measure and compare bacterial growth in the presence of different substances. These plates are often divided into thirds and used to study growth in three different mediums.
The EMB plate contains specialized dyes. The E standards for Eosin, a popular microbiology dye used to better detect certain cells. This plate uses a mixture of this and a popular blue methyl dye. As with option B, CNA is also a plate with a popular kind of dye, but neither of these is capable of detecting pathogen agents.
To detect pathogens, you would use a MacConkey plate. This plate contains selective and differential mediums, used to detect valid factors. This plate can detect Enterobacteria. These bacteria can at times be harmless but are often the main cause of pathogens.
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