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 of the following penicillins is effective against pseudomonas? \nSelect and explain. \nA. Piperacillin, B. Amoxycillin, C. Ampicillin, D. Oxacillin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ureidopeniclllins Piperacillin 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. Elimination tlh is 1 hr. Concurrent use of gentamicin or tobramycin is advised. ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SIXTH EDITION PAGE NO:702', 'role': 'assistant'}]