LPT-0021
QUESTION
The colour of the milk turns blue due to?
OPTIONS
(A) Pseudomonas sp.
(B) Micrococcus sp.
(C) Mycobacteria sp.
(D) E. coli
ANSWER
(A) Pseudomonas sp.
EXPLANATION
Blue discoloration of milk is classically associated with pigment-producing Pseudomonas species, historically described in dairy microbiology as causing blue milk. Micrococcus, Mycobacterium, and E. coli are not the characteristic cause of this blue pigment defect. Therefore, option (A) is correct.
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