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Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as: Assertion (A): Material used in the construction of a standard resistance is constantan or manganin. Reason (R): Temperature coefficient of constantan is very small.

A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)        

B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)

C) Assertion (A) is true but Reason (R) is false             

D) Assertion (A) is false and Reason (R) is also false