This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallbladder Cancer, Subject name: Surgery
[{'content': 'Organism associated with fish consumption that also cause carcinoma gallbladder: \nSelect and explain. \nA. Clonorchis sinensis, B. Gnathostoma, C. Strongyloides cantonensis, D. H. dimunata', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Clonorchis sinensis (Ref: Harrison 19/e p1428, 18/e p2008, 17/e p1330; http/www.ncbi.nlm.nih.gov/pubmed/12483392; www.ncbi.nlm.gov/pubmed/3993073)Clonorchis sinensisClonorchis sinensis is a liver fluke, acquired by ingestion of raw or inadequately cooked freshwater fishes.In human body, it lives within bile ducts and causes inflammatory reaction leading to cholangiohepatitis and biliary obstructionQ.It is a well known risk factor for cholangiocarcinoma.It is a rare, but mentioned risk factor for carcinoma gall bladderQ.', 'role': 'assistant'}]