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': "Loeffler's syndrome is characterized by - \nSelect and explain. \nA. Transient, migratory pulmonary infiltrations, B. Fibrosis in the pulmonary apices, C. Fibrosis in the base of one or both lungs, D. Miliary mottling", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]