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
Which among the following is the drug of choice for Clostridium difficile-induced colitis - 
Select and explain. 
A. Gentamicin, B. Ciprofloxacin, C. Metronidazole, D. Linezolid
C: Metronidazole
Answer: C: Metronidazole 
Explanation: None