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: Microbiology
[{'content': 'True regarding pseudomembranous colitis are all except- \nSelect and explain. \nA. It is caused by clostridium difficile, B. The organism is a normal commensal of gut, C. It is due to production of phospholipase A, D. It is treated by vancomycin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]