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
[{'content': 'Which one of the following drugs is an antipseudomonal penicillin? \nSelect and explain. \nA. Cephalexin, B. Cloxacillin, C. Pieperacillin, D. Dicloxacillin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]