Definition: 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'.
Input: Question: Of the following statements of the electron transport chain. Which is true ?: 
 Options:  <1> An FADH molecule can generate up to 2.5 molecules of ATP. <2> One molecule of NADH can generate up to 1.5 molecules of ATP. <3> Electrons flow from more positive reduction potentials to more negative reduction potentials. <4> Complex II (used by FADH2) does not transfer protons to the intermembrane space. <5> Complex III uses copper (Cu) atoms as cofactors.
