The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 35-year-old man presents to the emergency room due to shortness of breath that started an hour ago while playing football with some friends. He has had similar episodes in the past when he also had to be rushed to the hospital. Physical examination shows body temperature is 37.2°C (98.9°F), pulse rate is 100/min, respiratory rate is 28/min and blood pressure is 110/60 mm Hg. Also, it shows decreased breath sounds on both sides, the peak expiratory flow rate is 200 L/min and SpO2 is 89% on room air. The man is given an initial treatment with nebulization using an inhaled short-acting β-agonist. An arterial blood gas analysis shows the following: pH 7.48 PaO2 59 mm Hg PaCO2 26 mm Hg HCO3- 26 mEq/L After administering oxygen by mask, the man’s PaO2 increases to 75 mm Hg. Which of the following is the most likely cause of this patient’s condition?   (A) Asthma attack   (B) Carbon monoxide (CO) poisoning   (C) Neuromuscular disease   (D) Acute respiratory distress syndrome (ARDS)
['(A) Asthma attack <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Asthma attack \n (B) Carbon monoxide (CO) poisoning \n (C) Neuromuscular disease \n (D) Acute respiratory distress syndrome (ARDS) <> possible answers', '  A 35-year-old man presents to the emergency room due to shortness of breath that started an hour ago while playing football with some friends. He has had similar episodes in the past when he also had to be rushed to the hospital. Physical examination shows body temperature is 37.2°C (98.9°F), pulse rate is 100/min, respiratory rate is 28/min and blood pressure is 110/60 mm Hg. Also, it shows decreased breath sounds on both sides, the peak expiratory flow rate is 200 L/min and SpO2 is 89% on room air. The man is given an initial treatment with nebulization using an inhaled short-acting β-agonist. An arterial blood gas analysis shows the following:\npH 7.48\nPaO2 59 mm Hg\nPaCO2 26 mm Hg\nHCO3- 26 mEq/L\nAfter administering oxygen by mask, the man’s PaO2 increases to 75 mm Hg. Which of the following is the most likely cause of this patient’s condition? <> context@']