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
[{'content': "Curschmann's spirals in sputum are seen in: \nSelect and explain. \nA. Tuberculosis cavity, B. Asthma, C. Bronchitis, D. Bronchiectasis", 'role': 'user'}, {'content': "Answer: B \nExplanation: Curschmann's spirals refer to the spiral-shaped mucus plugs seen in the airways of asthmatics.", 'role': 'assistant'}]