This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 2 (Helminthology), Subject name: Microbiology
Uncooked Fish eating causing Megaloblastic Anemia is due to ? 
Select and explain. 
A. H. nana, B. Taenia saginata, C. Echinococcus, D. Diphyllobothrium Latum
D: Diphyllobothrium Latum
Answer: D: Diphyllobothrium Latum 
Explanation: Diphyllobothrium latum /Fish tapeworm DH-Man, IH-1st- cyclops 2nd- fish if man eats uncooked fish then larvae is ingested changes to ADULT forms-these adult forms settle up in small and large intestine - these decreases VIT B12absorption - causing megablastic anaemia