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: Medicine
[{'content': 'Charcot - Leyden crystals are derived from \nSelect and explain. \nA. Eosinophils, B. Basophils, C. Bronchial goblet cells, D. Mast cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]