Question

question 5
the indicator of mannitol salt agar media is_____________ it selects for ___________
neutral red, gram - negative
neutral red, staphylococcus
phenol red, staphylococcus
phenol red, gram - negative

Explanation:

Mannitol Salt Agar (MSA) uses phenol red as an indicator. MSA is a selective medium for Staphylococcus (due to high salt concentration, which inhibits most other bacteria, while Staphylococcus can tolerate it). Neutral red is not the indicator for MSA, and MSA selects for Staphylococcus (not gram - negative, as gram - negative bacteria are inhibited by high salt). So the correct option is the one with phenol red and Staphylococcus.

Answer:

C. phenol red, Staphylococcus