The correct option is A Schistosoma
Schistosoma is a parasitic flatworm belonging to phylum Platyhelminthes. It is a blood fluke. This parasite lives in hepatic portal vein, mesenteric blood vessels, urinary tract blood vessels and lymph nodes in human beings. These are not hermaphroditic but dioecious, forming separate sexes.
So, the correct answer is option A.