A 58-year-old man presents with a 4-day history of productive cough, fever, and dyspnea. Chest X-ray shows right middle lobe consolidation with loss of the right heart border. High-resolution CT confirms lobar consolidation. The structure marked **B** in the diagram—air bronchograms within the consolidation—is a characteristic finding. Which of the following is the MOST COMMON bacterial pathogen responsible for this presentation?
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