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
[{'content': 'Megaloblastic anaemia is caused by \nSelect and explain. \nA. Diphyllobothrium Latum, B. H. Nana, C. Echinococcus Granulosus, D. T. Solium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Adult worm absorbs Vit B12.', 'role': 'assistant'}]