The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A patient with a1-antitrypsin deficiency is warned by his physician that his increasing dyspnea may be worsened by his continued cigarette smoking. Which of the following factors, released by both neutrophils and alveolar macrophages, is responsible for the patient's condition?   (A) Major Basic Protein   (B) Mucus   (C) Surfactant   (D) Elastase
['(D) Elastase <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Major Basic Protein \n (B) Mucus \n (C) Surfactant \n (D) Elastase <> possible answers', "  A patient with a1-antitrypsin deficiency is warned by his physician that his increasing dyspnea may be worsened by his continued cigarette smoking. Which of the following factors, released by both neutrophils and alveolar macrophages, is responsible for the patient's condition? <> context@"]