The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 70-year-old man with a history of hypertension and atrial fibrillation comes to the physician for shortness of breath with mild exertion, progressive weakness, and a dry cough that has persisted for 6 months. He has smoked a pack of cigarettes daily for 45 years. His medications include warfarin, enalapril, and amiodarone. His pulse is 85/min and irregularly irregular. Physical examination shows enlarged fingertips and markedly curved nails. A CT scan of the chest shows clustered air spaces and reticular opacities in the basal parts of the lung. Which of the following is the most likely underlying mechanism of this patient's dyspnea?   (A) Chronic airway inflammation   (B) Bronchial hyperresponsiveness and obstruction   (C) Pleural scarring   (D) Excess collagen deposition in the extracellular matrix of the lung
['(D) Excess collagen deposition in the extracellular matrix of the lung <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Chronic airway inflammation \n (B) Bronchial hyperresponsiveness and obstruction \n (C) Pleural scarring \n (D) Excess collagen deposition in the extracellular matrix of the lung <> possible answers', "  A 70-year-old man with a history of hypertension and atrial fibrillation comes to the physician for shortness of breath with mild exertion, progressive weakness, and a dry cough that has persisted for 6 months. He has smoked a pack of cigarettes daily for 45 years. His medications include warfarin, enalapril, and amiodarone. His pulse is 85/min and irregularly irregular. Physical examination shows enlarged fingertips and markedly curved nails. A CT scan of the chest shows clustered air spaces and reticular opacities in the basal parts of the lung. Which of the following is the most likely underlying mechanism of this patient's dyspnea? <> context@"]