Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes) ; nonhalophiles will not grow.Among the halophiles,mannitol fermenters will produce acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red.Onto MSA you inoculate a halophilic mannitol fermenter and a halophilic mannitol nonfermenter.In this case,the medium is acting as (a) __________ medium(s) .
A) selective
B) differential
C) selective and differential
D) enrichment
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