Q: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Question: COMPLETE: in the Krebs cycle 4 oxidation reactions occur, in 3 of them the final acceptor electron is ___ and in the other is ___:
Options: <1> FAD / FMN. <2> NAD + / FMN. <3> NADP + / FAD. <4> NAD + / FAD. <5> FAD / NAD +.
A:
4