Task: Question Answering
Input (English): Question: The toxic effect of antimycin and cyanide is due to its interaction with: 
 Options:  <1> The systems of transport of fatty acids into the mitochondria. <2> The cytochromes of the mitochondrial electronic transport chain. <3> The enzymes of glycolysis. <4> The dehydrogenase enzymes of the citric acid cycle. <5> The enzymes that catalyze the replication of DNA.
Output (English): 2