  We derive the fluctuation theorem for a stochastic and periodically driven
system coupled to two reservoirs with the aid of a master equation. We write
down the cumulant generating functions for both the current and entropy
production in closed compact forms so as to treat the adiabatic and
nonadiabatic contributions systematically. We derive the fluctuation theorem by
taking into account the time reversal symmetry and the property that the
instantaneous currents flowing into the left and the right reservoir are not
equal. It is found that the fluctuation-dissipation relation derived from the
fluctuation theorem involves an expansion with respect to the time derivative
of the affinity.
