question: Q:A 60-year-old man who is a chronic smoker comes to the hospital with the chief complaint of shortness of breath which has worsened over the past 2 days. He also has a productive cough with yellowish sputum. There is no history of hemoptysis, chest pain, fever, palpitations, or leg swelling. He had a viral illness one week ago. He has been using an inhaler for 10 years for his respiratory disease. He sleeps with 2 pillows every night. He received 100 mg of hydrocortisone and antibiotics in the emergency department, and his symptoms have subsided. His FEV1/FVC ratio is < 0.70, and FEV1 is 40% of predicted. What is the most likely finding that can be discovered from the histology of his bronchioles?? 
  {'A': 'Curschmann spirals', 'B': 'Charcot-Leyden crystals', 'C': 'Increase Reid index', 'D': 'Ferruginous bodies', 'E': 'Non-caseating granuloma'},