Given below are two statements. In the light of the above statements, choose the most appropriate answer from the options given below:

Statement I:Chlorine is one of the most commonly used and inexpensive chemical disinfectants for water.

Statement II:Optimum fluoride levels in drinking water help prevent cavities in children.

ABoth Statement I and Statement II are correct ✓ Correct

BBoth Statement I and Statement II are incorrect

CStatement I is correct but Statement II is incorrect

DStatement I is incorrect but Statement II is correct

Correct answer: (A) Both Statement I and Statement II are correct

Explanation

Chlorine is the most widely used and cheapest chemical disinfectant, killing pathogens in drinking water supplies.

Statement 1 is correct as chlorination remains the standard low-cost method of water disinfection worldwide.

Statement 2 is correct because a small optimum level of fluoride strengthens tooth enamel and reduces dental cavities in children.

Too much fluoride, however, causes dental and skeletal fluorosis, so the level must stay within a safe range.

Chlorine can leave a residual that guards water against recontamination in the distribution network.

The commonly recommended fluoride level in drinking water is around one milligram per litre.

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