This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
A fisherman presents with C/O chronic diarrhea and fatigue. His physician orders a P/S, which reveals a megaloblastic anemia. Most likely cause is 
Select and explain. 
A. Clonorchis sinensis, B. D. latum, C. E. granulosus, D. T. saginata
B: D. latum
Answer: B: D. latum 
Explanation: .