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': 'Sudha, a 20 year old female developed antibiotic associated pseudomembranous colitis caused by Clostridium difficile. Which of the following drugs is most likely to be effective in the treatment of this disease ? \nSelect and explain. \nA. Ampicillin, B. Clindamycin, C. Metronidazole, D. Chloramphenicol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]