An adult patient presents with a 2-day history of intermittent

An adult patient presents with a 2-day history of intermittent stabbing chest pain that worsens with deep breaths. The patient reports a nonproductive cough and no fever for several days, and denies trauma, palpitations, or GI symptoms. T = 98.7°F (37°C), P = 86, R = 20/min, BP = 112/60 mm Hg, O2 Sat = 97%. Lungs are clear to auscultation, and heart sounds are normal S1 and S2 without murmurs, clicks, or rubs. Physical examination reveals localized chest wall tenderness at the costal margin. An EKG shows normal sinus rhythm. Chest X-ray is normal. The most likely diagnosis is: Group of answer choices costochondritis. myocardial infarction. pulmonary embolism. pneumonia.

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