A phenol coefficient is defined as

Ratio of concentration of disinfectants to that of concentration of phenol

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Ratio of concentration of phenol to that of concentration of disinfectants

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Ratio of concentration of antibiotics to that of concentration of disinfectants

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Ratio of concentration of antibodies to that of concentration of disinfectants

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Solution

The correct option is A Ratio of concentration of disinfectants to that of concentration of phenol
Phenol coefficient is a number relating the microbial killing efficiency of a compound to phenol. It is calculated by dividing the concentration of the test compound at which it kills the test organism in 10 minutes by the concentration of phenol that kills the organism under the same conditions. A higher coefficient value indicates an increased efficiency of the disinfectant. Thus the correct answer is option B.

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