This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Parasitic Drugs, 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: Metronidazole is the drug which is used to treat antibiotic associated pseudomembranous enterocolitis and is a component of anti H. pylori triple drug regimen. PSEUDO-MEMBRANE COLITIS MC organism responsible Clostridium difficile MC cause 3rd Gen. Cephalosporins > clindamycin DOC Metronidazole - Oral vancomycin According to latest guidelines, now oral vancomycin has become DOC for Pseudomembranous colitis.', 'role': 'assistant'}]