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Assertion (A): The grade of grinding wheel is a measure of hardness of the abrasive used for the wheel

Reason (R): Grading is necessary for making right selection of the wheel for a particular work

(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 the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

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