A 68-year-old male with COPD on mechanical ventilation for 5 days develops fever, purulent sputum, and a new infiltrate on chest X-ray. Gram stain shows gram-negative rods. Culture grows Pseudomonas aeruginosa susceptible to all antipseudomonal agents. What is the drug of choice for ventilator-associated pneumonia caused by P. aeruginosa?

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