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': 'Cholangiocarcinoma is caused by -a) Fasciola infestationb) Clonorchis infestationc) Paragonimus infestationd) Ascaris infestatione) None of these \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Parasites\n\nSchistosoma haematobium\nClonorchis sinensis\nOpisthorchis viverrini\n\nMalignancy\n\nSquamous cell carcinoma of urinary bladder\nCholangiocarcinoma of liver, bile duct and Adenocarcinoma of pancreas\nCholangiocarcinoma of bile duct', 'role': 'assistant'}]