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
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- 
Select and explain. 
A. Fasciola buski, B. Clonorchis sinensis, C. Strongyloides, D. Ankylostoma
B: Clonorchis sinensis
Answer: B: Clonorchis sinensis 
Explanation: None