Believe this question is referring to Visceral Leishmaniasis.
other answer choices
black fly - onchocera volvulus (river blindness)
tsetse fly - trypanosoma brucei (african sleepling sickness)
deer fly - F. tularensis
Visceral Leishmaniasis aka. "Kala-Azar"
Caused by Leishmania Donovani. (an intracellular protozoan)
Transmitted via the Phlebotomine Sand Fly.
Treated with Amphoterrible B. Can also use Sodium Stibogluconate, miltefosine, or paromomycin.
Will commonly be seen with pancytopenia, fever, and splenomegaly are the three big clues. Other symptoms you can see are night sweats, blackening of the skin, scaly skin, weakness, and substantial weight loss. This will kill ya if you don't get treatment.