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: Medicine
[{'content': 'Which among the following is the drug of choice for Clostridium difficile-induced colitis - \nSelect and explain. \nA. Gentamicin, B. Ciprofloxacin, C. Metronidazole, D. Linezolid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]