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: Pharmacology
Which does not cause pseudomembranous enterocolitis? 
Select and explain. 
A. Vancomycin, B. Levofloxacin, C. Clindamycin, D. Ceftazidime
A: Vancomycin
Answer: A: Vancomycin 
Explanation: None