Task: Question Answering
Input (English): Question: The cholera toxin: 
 Options:  <1> Inhibits protein synthesis. <2> It is hemolytic and dermonecrotic. <3> Alters the flow of electrolytes in the intestine. <4> It is formed by a single polypeptide that is cleaved by the effect of proteases. <5> It produces food poisoning.
Output (English): 3