This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Drug given for antibiotic associated pseudomembranous enterocolitis and is part of anti H. Pylori treatment: \nSelect and explain. \nA. Amoxicillin, B. Vancomycin, C. Metronidazole, D. Clotrimazole', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. MetronidazoleTriple drug regimen given for H. Pylori include- clarithromycin, amoxicillin, tetracycline, metronidazole. Out of all these drugs metronidazole is drug of choice for pseudomembranous colitis.', 'role': 'assistant'}]