A 55-year-old woman with lung cancer undergoes chemotherapy. On day 10 post-treatment, she develops fever (38.5°C), cough, and dyspnea. Chest X-ray shows right upper lobe consolidation with air bronchograms. Sputum is culture-negative but PCR confirms Pneumocystis jirovecii pneumonia (PCP). She is not on prophylaxis. What is the drug of choice?

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