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B
Tropical areas
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C
Subtropical areas
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D
Hilly tracts
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Solution
The correct option is B Tropical areas
Elephantiasis is a condition characterized by gross enlargement of an area of the body, especially the limbs. Other areas commonly affected include the external genitals. Elephantiasis is caused by obstruction of the lymphatic system, which results in the accumulation of a fluid called lymph in the affected areas.
Elephantiasis occurs with the greatest frequency in tropical regions including Southeast Asia, India, Africa and South America as a manifestation of lymphatic filariasis.