This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
Natural habitat of Schistosoma (blood flukes): 
Select and explain. 
A. Veins of the urinary bladder, B. Portal and pelvic veins, C. Vesical plexuses, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is 'd' i.e., All of the above(Ref: Chatterjee, 12th/e, 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).