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
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 filariasis Occult filariasis is a rare condition which is caused by hypersensitivity reaction to filarial antigen. Micro filatia are absent in the blood. Lymphatic filariasis is absent. Indirect evidence of filarial infection is obtained by demonstrating antifilarial antibodies