40 year old male from Bihar complains of pain abdomen, having hepatosplenomegaly, peripheral smear on stain shows

Ans. is 'b' i.e., Leishmania The information in question are :- Patient is from Bihar Hepatosplenomegaly with abdominal pain. Kala azar typically presents with splenomegaly and hepatomegaly, and is common in Bihar. Thus the most probable diagnosis is kala azar caused by Leishmania donovani. Malaria can also present with abdominal pain with hepatosplenomegaly. But the classical presentation is history of paroxysms of chills-fever-sweating, especially with P. vivax species. Thus among the given scenario, Leishmania is the best answer