This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'True about Biliiary cystic adenocarcinoma \nSelect and explain. \nA. CT scan is used for diagnosis, B. CA 19-9 is elevated, C. Intrahepatic location, D. Extrahepatic location', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .hepatic cystadencarcinoma arising from pre existing cystadenoma with mesenchymal stroma,which occurs only in young females ,carries good prognosis.resection is the treatment .it carries good prognosis.MRI is diagnostic.US/CT scan is also helpful.ERCP is done to identify communication with biliary sysytem.usually to proximal left hepatic duct. ref : SRB&;s manual of surgery,5 th ed,pg no 614', 'role': 'assistant'}]