Microbiology Which of the following species of clostridium causes pseudomembranous colitis? A Clostridium difficile B Clostridium perfringens C Clostridium tetani D Clostridium botulinum 💡 Explanation Which of the following species of clostridium causes pseudomembranous colitis? ✓ Correct Answer: A. Clostridium difficile