(D) Fluoride pollution,when present in drinking water at concentrations higher than $1.5 \ ppm$,primarily affects the skeletal system and teeth. This

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(D) Fluoride pollution,when present in drinking water at concentrations higher than $1.5 \ ppm$,primarily affects the skeletal system and teeth. This condition is known as fluorosis. In teeth,it causes dental fluorosis,which leads to mottling or discoloration of the enamel. Therefore,the correct option is $D$.