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: 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: Loeffler's syndrome is a benign,acute eosinophilic pneumonia of unknown cause(idiopathic/primary eosinophilic pneumonia) characterised by transient migrating pulmonary infiltrates and minimal clinical manifestations. Loefflers syndrome caused by ascaris,hookworm,schistosomiasis. symptoms include dyspnea,cough,wheeze,HEMOPTYSIS which are self limited. Reference:Harrison's Medicine-20 edition,page no:1975.", 'role': 'assistant'}]