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
Drug most commonly implicated in causing pseudo membranous colitis is : 
Select and explain. 
A. Clindamycin, B. Streptomycin, C. Amoxicillin, D. Metronidazole
A: Clindamycin
Answer: A: Clindamycin 
Explanation: None