Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes) .Among the halophiles,mannitol fermenters release acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red.Onto MSA you inoculate a halophilic mannitol fermenter,a nonhalophilic mannitol fermenter,and a halophilic mannitol nonfermenter.Thus,the medium is acting as a __________ medium.
A) selective
B) differential
C) selective and differential
D) neither selective nor differential
Correct Answer:
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