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
True about Biliiary cystic adenocarcinoma 
Select and explain. 
A. CT scan is used for diagnosis, B. CA 19-9 is elevated, C. Intrahepatic location, D. Extrahepatic location
A: CT scan is used for diagnosis
Answer: A: CT scan is used for diagnosis 
Explanation: .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