Detailed Instructions: 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'.
Q: Question: Which Clostridium genus is a producer of enterotoxin A and cytotoxin B responsible for diarrhea (pseudomembranous colitis) associated with treatment with antimicrobials ?:
Options: <1> Clostridium perfringens. <2> Clostridium difficile. <3> Clostridium botulinum. <4> Clostridium novyi. <5> Clostridium histolyticum.
A:
2