Assertion (A) : Fluorosis results if `F^(-)` ion concentration exceeds 10 ppm in drinking water. Reason (R) : Nalgonda technique

Assertion (A) : Fluorosis results if `F^(-)` ion concentration exceeds 10 ppm in drinking water.
Reason (R) : Nalgonda technique is a cheap method for removing `F^(-)` ions drinking water.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not correct explanation of A.
C. A is true and R is false
D. A is false and R is true.

Assertion (A) : Fluorosis results if `F^(-)` ion concentration exceeds 10 ppm in drinking water. Reason (R) : Nalgonda technique is a cheap method for

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