This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Curschmann's crystals are seen in - 
Select and explain. 
A. Bronchial asthma, B. Bronchiectasis, C. Chronic bronchitis, D. Wegener's granulomatosis
A: Bronchial asthma
Answer: A: Bronchial asthma 
Explanation: Pathology of Asthma
Gross -

Lungs are overdistended because of overinflation and there may be a small area of atelectasis.
The most striking macroscopic finding is occlusion of bronchi and bronchioles by thick tenacious mucus plugs.

Histology -

Characterized by the presence of numerous eosinophils and neutrophils.

Curschmann's spiral - Whorls of shed epithelium in mucous plugs.
Charcot -Leyden crystals - Collection of crystalloids made up of eosinophilic membrane protein.
The other characteristic histological finding of Asthma is collectively called Airway remodelling, it includes -

Thickening of the basement membrane of the bronchial epithelium.
Edema and an inflammatory infiltrate in the bronchial walls with a prominence of eosinophils and mast cells.
An increase in the size of submucosal glands.
Hypertrophy of bronchial wall muscle.

The "airway remodelling" contributes to airflow obstruction.