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
[{'content': "Sputum from an asthma patient may show ? \nSelect and explain. \nA. Numerous eosinophils, B. Curschmann's spirals, C. Charcot-Leyden crystals, D. All of the above", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., All of the above", 'role': 'assistant'}]