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Assertion (A) : Fluorosis results if F^(...

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.

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