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 good activity against Pseudomonas aeruginosa except ? \nSelect and explain. \nA. Cephadroxil, B. Cefepime, C. Cefoperazone, D. Ceftazidime', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Cephadroxil o Cephalosporins with antipseudomonal activity :- Ceftazidime, Cefoperazone, Cefepime", 'role': 'assistant'}]