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': "Central dot sign is seen in \nSelect and explain. \nA. Primary sclerosing cholangitis, B. Liver Hamaoma, C. Caroli's disease, D. Polycystic liver disease", 'role': 'user'}, {'content': 'Answer: C \nExplanation: "central dot" sign: enhancing dots within the dilated intrahepatic bile ducts, representing poal radicles (seen in CT).', 'role': 'assistant'}]