input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 62-year-old man with a history of chronic bronchitis comes to the physician because of a 1-month history of worsening shortness of breath and cough productive of thick sputum. He smoked one pack of cigarettes daily for 20 years but quit 5 years ago. Physical examination shows an increased anteroposterior chest diameter and coarse crackles in the lower lung fields bilaterally. Treatment with a drug that directly antagonizes the effects of vagal stimulation on the airways is begun. Which of the following drugs was most likely started?   (A) Fluticasone   (B) Montelukast   (C) Tiotropium   (D) Cromolyn
output: ['(C) Tiotropium <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Fluticasone  (B) Montelukast  (C) Tiotropium  (D) Cromolyn <> possible answers', '  A 62-year-old man with a history of chronic bronchitis comes to the physician because of a 1-month history of worsening shortness of breath and cough productive of thick sputum. He smoked one pack of cigarettes daily for 20 years but quit 5 years ago. Physical examination shows an increased anteroposterior chest diameter and coarse crackles in the lower lung fields bilaterally. Treatment with a drug that directly antagonizes the effects of vagal stimulation on the airways is begun. Which of the following drugs was most likely started? <> context']