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': 'Malignant hydatid cyst is caused by: \nSelect and explain. \nA. Echinococcus granulosus, B. E. multilocularis, C. E. vogeli, D. E. oligahus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. E. multilocularis', 'role': 'assistant'}]