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Which among the following is not a bacterial group which occurs in milk?

(a) Lactic acid bacteria

(b) Coliform bacteria

(c) Putrefaction bacteria

(d) Carboxylic acid bacteria

This question was posed to me during an internship interview.

The above asked question is from Bacteria topic in chapter Micro-organisms in Milk of Dairy Engineering

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Right answer is (d) Carboxylic acid bacteria

The explanation is: The groups of bacteria which occur in milk can be divided into lactic acid bacteria, coliform bacteria, butyric acid bacteria, propionic acid bacteria and putrefaction bacteria.

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