A patient with a 2-year history of asthma, previously well controlled, presents for progressive worsening of symptoms in spite of good adherence to treatment with scheduled steroid inhalers. The patient has no exposure to pets and is not a smoker. Chest X-ray is unremarkable. What pathology should this patient be worked up for? Tuberculosis Allergic bronchopulmonary aspergillosis Pulmonary embolism Bronchiectasis Pneumoconiosis
