This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Natural habitat of Schistosoma (blood flukes) ? 
Select and explain. 
A. Veins of the urinary bladder, B. Poal & 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