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': 'A man on return from a country complains of pain in abdomen, jaundice, with increased alkaline phosphatase and conjugated hyperbilirubinemia. USG shows blockage in the biliary tree. What could be the cause- \nSelect and explain. \nA. Fasciola buski, B. Clonorchis sinensis, C. Strongyloides, D. Ankylostoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]