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 of the following is an antipseudomonal penicillin? 
Select and explain. 
A. Piperacillin, B. Amoxycillin, C. Oxacilline, D. Nafcillin
A: Piperacillin
Answer: A: Piperacillin 
Explanation: Piperacellin is an antipseudomonalpenicillin and is an extended spectrum beta-lactam antibiotic of the ureidopenicillin class. Ref: KDT, 6th Edition, Pages 696-702; Advances in Ampicillin Research And Application, 2011 Edition, Page 27