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': 'All the following are true about pseudomembranous colitis except. \nSelect and explain. \nA. Clostridium difficile is the agent, B. Diarrhoea is the most common manifestation, C. Pseudomembrane formation, D. Vancomycin is responsible', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Oral vancomycin is the DOC for pseudomembranous colitis.', 'role': 'assistant'}]