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 following drugs is effective against Pseudomonas infection ? \nSelect and explain. \nA. Ampicillin, B. Ceftriaxone, C. Colistin, D. Cefixime', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Colistin o Polypeptides like colistin and polymyxin B are effective against pseudomonas. o Carbenicillin, ticarcillin, piperacillin, azlocillin and mezlocillin are the penicillins effective against pseudomonas whereas cefoperazone, ceftazidime, cefepime and cefpirome are cephalosporins effective against pseudomonas.", 'role': 'assistant'}]