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: Pharmacology
[{'content': 'Pseudomembranous colitis is associated with: \nSelect and explain. \nA. Vancomycin, B. Lincomycin, C. Rovamycin, D. Clindamycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Clindamycin', 'role': 'assistant'}]