Assertion : current through a pure inductor is wattless.
Reason : Phase difference between e.m.f across a pure inductor and current through it is  ${90}^0$ or $\frac{\pi }{2}$

If both assertion and reason are  true, and the reason is the correct explanation of assertion.

If the assertion is false but the reason is true

If both assertion and reason are  true, and the reason is not a correct explanation of assertion.

If the assertion is true but the reason is false