50 一位 79 歲患者是老菸槍，平常的肺功能為FEV1 /FVC = 0.6，FEV1 = 36% 預期值，有輕微發燒，咳嗽 有黃痰，呼吸困難且有cyanosis；則其最有可能之診斷為：
(A) Severe chronic obstructive pulmonary disease with acute exacerbation complicated with respiratory failure
(B) Severe asthma with respiratory failure
(C) Myocardial infarction
(D) Pneumonia

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統計： A(42), B(0), C(0), D(1), E(0) #1064076