This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
Drug of choice for Cl. difficile ? 
Select and explain. 
A. Metronidazole, B. Vancomycin, C. Rifampicin, D. Ciprofloxacin
B: Vancomycin
Answer: B: Vancomycin 
Explanation: Drug of choice is oral vancomycin and second drug of choice Metronidazole