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': 'Select the drug which is used to treat antibiotic associated pseudomembranous enterocolitis and is a component of anti H. pylori triple drug regimen : \nSelect and explain. \nA. Amoxicillin, B. Vancomycin, C. Metronidazole, D. Clotrimazole', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]