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
Tropical pulmonary eosinophilia is caused because of - 
Select and explain. 
A. Occult filariasis, B. Cerebral melaria, C. Penumonic plague, D. Asthmatic bronchitis
A: Occult filariasis
Answer: A: Occult filariasis 
Explanation: 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.