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
Which among the following is the drug of choice for clostridium difficile-induced colitis? 
Select and explain. 
A. Gentamicin, B. Metronidazole, C. Oral Vancomycin, D. Linezolid
C: Oral Vancomycin
Answer: C: Oral Vancomycin 
Explanation: 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