This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Large intestine, Subject name: Surgery
[{'content': 'Which among the following is the drug of choice for clostridium difficile-induced colitis? \nSelect and explain. \nA. Gentamicin, B. Metronidazole, C. Oral Vancomycin, D. Linezolid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: TREATMENT OF PMC Immediate cessation of the offending antimicrobial agent Mild disease : Oral Vancomycin :Drug of choice Severe disease: Bowel rest , IV hydration , & IV Metronidazole or Oral Vancomycin', 'role': 'assistant'}]