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': 'Which of the iollowing drug is used against bacteria Pseudomonas aeruginosa? \nSelect and explain. \nA. Piperacillin-Tazobactum, B. Cefotaxime, C. Streptomycin, D. Cephalexin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Piperacillin-Tazobactum', 'role': 'assistant'}]