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Constantan and maganin are used to make ...

Constantan and maganin are used to make standard resistance because:

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Because its temperature co-efficient of resistance is very low i.e., its resistance does not change with change in temperature.
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Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : Manganin or constantan is used for making standard resistances. Reason : Their resistivity is high, while temperature coefficient is low.

Why Manganin is used to make standard resistance coil ? How does the electric resistance of metal varies with the rise in its temperature ?