This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
[{'content': 'Tropical pulmonary eosinophilia is caused because of - \nSelect and explain. \nA. Occult filariasis, B. Cerebral melaria, C. Penumonic plague, D. Asthmatic bronchitis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Occult filariasiso Occult filariasis is a rare condition which is caused by hypersensitivity- reaction to filarial antigen.o Micro filatia are absent in the blood.o Lymphatic filariasis is absent.o Indirect evidence of filarial infection is obtained by demonstrating antifilarial antibodies.", 'role': 'assistant'}]