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  1. Which one of the following insects spreads Kala-azar ?
    1. Fruit fly
    2. Tsetse fly
    3. Sand fly
    4. Mosquito
Correct Option: C

Sand fly insects spread Kala-azar. Kala-azar is a chronic and potentially fatal parasitic disease of the viscera (the internal organs, particularly the liver, spleen, bone marrow and lymph nodes) due to infection by the parasite called Leishmania donovani. Leishmania donovani, the agent of kala-azar , is transmitted by sandfly bites.



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