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 conversion of pyruvate into ethanol and CO2 by yeasts:
Options: <1> It produces an extra amount of ATP. <2> Reduce the NAD +. <3> Reoxidates the NADPH that forms in glycolysis. <4> It allows glycolysis to continue even in the absence of oxygen. <5> Allows CO2 to be used in the synthesis of fatty acids.
A:
4