For reliable results, the niacin test should be
A) performed only from cultures on L-J that are at least 2 weeks old and show at least five colonies.
B) performed only from cultures on L-J that are at least 3 weeks old and show at least 50 colonies.
C) performed only from cultures on 7H11 agar that are at least 3 weeks old and show at least 50 colonies.
D) performed only from cultures on 7H11 agar that are at least 2 weeks old and show at least five colonies.
Correct Answer:
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