What unit is used to measure reactance?

Reactance is the specific opposition to alternating current (AC) caused by capacitance or inductance in a circuit. While pure resistance opposes current by dissipating power as heat, reactance restricts current by temporarily storing energy in electric or magnetic fields. Because reactance restricts the flow of current in a manner similar to resistance, it is measured using the exact same standard unit: the Ohm. The other options provided are units for different electrical properties. For instance, the Farad measures capacitance itself, not the resulting opposition to alternating current, while the Siemens is the unit for conductance.