This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: COPD and Asthma, Subject name: Medicine
Curschmann's spirals in sputum are seen in: 
Select and explain. 
A. Tuberculosis cavity, B. Asthma, C. Bronchitis, D. Bronchiectasis
B: Asthma
Answer: B: Asthma 
Explanation: Curschmann's spirals refer to the spiral-shaped mucus plugs seen in the airways of asthmatics.