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': 'In treatment of pseudomonas infections, carbenicillin is frequently combined with - \nSelect and explain. \nA. Penicillin, B. Gentamycin, C. Ciprofloxacin, D. Amoxycillin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Gentamycin o For most of the infection of pseudomonas, treatment of choice is the combination of an antipseudomonal t3-lactam and an aminoglycoside.", 'role': 'assistant'}]