This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Penicillin & Cephalosporin, Subject name: Pharmacology
[{'content': 'Drug not affecting pseudomonas aeruginosa - \nSelect and explain. \nA. Levofloxacin, B. Ampicillin, C. Norfloxacin, D. Ciprofloxacin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Ampicillin Drugs acting against Pseudomonas.o Penicillins - Piperacillin, Carbenicillin, Ticarcillin, Mezlocillin,o Cephalosporins - Ceftazidime, Cefoperazone, Cefepime.o Carbapenems - Imipenem, meropenemo Monobactams - Aztreonam.o Aminoglycosides - Tobramycin, Gentamycin, Amikacin,o Fluroquinolones - Ciprofloxacin, Levofloxacin. Norfloxacin,o Other - Poiymixin B, Colistin.o For most of the infection of pseudomonas, treatment of choice is the combination of an antipseudomonal b- lactant and an aminoglycoside.", 'role': 'assistant'}]