This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Which of the following is not true regarding pseudomembranous  colitis? \nSelect and explain. \nA. Antibiotic associated diarrhea eg: 3rd gen cephalosporins ., B. Characterised by pseudomembranes at the site of mucosa injury., C. Presents as watery diarrhea, abdominal pain and fever, D. Clostridium difficile is the only cause.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Though\xa0pseudomembranous\xa0colitis is clasically caused by clostridium difficile, but also caused by salmonella, clostridium perfringes and saurevs in some cases.', 'role': 'assistant'}]