This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pediatrics
[{'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: a. Transient, migratory pulmonary infiltrations(Ref: Nelson 20/e p 2080)Loeffler\'s syndrome is now called "transient pulmonary infiltrates with eosinophilia syndrome" and is most commonly caused by Ascaris lumbricoides or roundworm.', 'role': 'assistant'}]