Correct option (c) sand fly
Explanation:
Kala-azar and oriental sore both the disease are caused by Leishmania.It ls digenetic and intermediate host is sand fly belonging to the genus Phlebotomus.
Leishmania donovani causes kala-azar or visceral leishmaniasis which is also called dum-dum fever, infection occurs chiefly in spleen and liver, secondarily in bone marrow and intestinal villi.
L. tropica causes oriental sore or cutaneous leishmaniasis in man.
