dB is a standard abbreviation used for the quantitative expression of

A particular pollutant

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The dominant Bacillus in a culture

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A certain pesticide

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The density of bacteria in a medium.

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Solution

The correct option is B A particular pollutant
dB stands for deciBel. It is a standard abbreviation used for the quantitative expression of sound level. It is used for measuring relative loudness of the sound. It's high levels correspond to noise pollution.
So, the correct option is A, a particular pollutant.

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