A 62-year-old man with chronic obstructive pulmonary disease presented to the emergency department with a 2-day history of dyspnea. He required intubation and ventilation when he was found to be in hypercapnic respiratory failure. Five days after admission to the ICU, his urine became green.
Which of the following medications caused this?
B) Morphine sulfate
C) Ipratropium bromide
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