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': 'Drug-induced colitis is most frequently associated with: \nSelect and explain. \nA. Neomycin, B. Vancomyc in, C. Clindamycin, D. Chloramphenicol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c. Clindamycin', 'role': 'assistant'}]