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: The enzyme succinate dehydrogenase catalyses the dehydrogenation reaction dependent on: 
 Options:  <1> NADPH. <2> FMN <3> NAD +. <4> FAD. <5> CoA.
A:
4