This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Malignant hydatidosis is caused by \nSelect and explain. \nA. Echinococcus granulosus, B. Echinococcus multilocularis, C. Echinococcus vogelli, D. Echinococcus oligahus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]