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
Antipseudomonals are all, EXCEPT : 
Select and explain. 
A. Cephalexin, B. Carbenicillin, C. Piperacillin, D. Ceftazidime
A: Cephalexin
Answer: A: Cephalexin 
Explanation: None