Tropical pulmonary eosinophilia is caused because of

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