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A short, nonsmoking 44-year-old male presents to the emergency room with left-sided chest pain and a cough. He states that the pain started abruptly and worsens with deep breathing and coughing. He denies recent injury. Assessment includes shallow respirations with a rate of 36, normal breath sounds, and no cyanosis. Which condition is most likely causing his symptoms?

A. Myocardial infarction
B. Spontaneous pneumothorax
C. Pleuritis related to infection
D. Obstructive atelectasis