Task: Question Answering
Input (English): Question: Infections caused by Clostridium tetani, Bordetella pertussis, Corynebacterium diphtheriae and Vibrio cholerae have in common: 
 Options:  <1> The type of transmission. <2> The reservoir. <3> The production of exotoxins. <4> The affected organs. <5> The route of infection.
Output (English): 3