<prompt> Natural habitat of Schistosoma blood flukes:Veins of the urinary bladderPortal and pelvic veinsVesical plexusesAll of the above  <response>: Ans. is d i.e., All of the aboveRef: Chatterjee, 12the, p. 136 S. Haematobium - Veins of Vesical and Pelvic plexuses, less commonly in portal vein and its mesenteric branch. S. Mansoni - Mesenteric veins draining Sigmoidorectal region inferior mesenteric veins. S. Japonicum - Mesenteric veins draining Ileocecal region superior mesenteric vein. 