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
The antibiotic causing pseudomembranous colitis is : 
Select and explain. 
A. Clindamycin, B. Garamycin, C. Erythromycin, D. Vancomycin
A: Clindamycin
Answer: A: Clindamycin 
Explanation: None