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
[{'content': 'All of the following cephalosporins have a good activity against pseudomonas aeruginosa EXCEPT: March 2003 \nSelect and explain. \nA. Cephadroxil, B. Cefipime, C. Cefoperazone, D. Ceftazidime', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Cephadroxil', 'role': 'assistant'}]