This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Which one of the following drugs is an antipseudomonal penicillin? 
Select and explain. 
A. Cephalexin, B. Cloxacillin, C. Pieperacillin, D. Dicloxacillin
C: Pieperacillin
Answer: C: Pieperacillin 
Explanation: This antipseudomonal penicillin is about 8 times more active than carbenicillin. It has good activity against Klebsiella and is used mainly in neutropenic/immunocompromised patients having serious gram-negative infections, and in burns. ESSENTIALS OF MEDICAL PHARMACOLOGY page no 724