This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Clostridium difficile infection risk increases on use of 
Select and explain. 
A. Ciprofloxacin, B. Metronidazole, C. Vancomycin, D. Teicoplanin
A: Ciprofloxacin
Answer: A: Ciprofloxacin 
Explanation: Ciprofloxacin increases risk of C.difficile enterocolitis.Metronidazole, vancomycin, teicoplanin are effective agaist C. difficile in cases of pseudomembranous colitis.Ref: Bailey and Love 27e pg: 56