This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ULTRASOUND, Subject name: Radiology
[{'content': "TRIANGULAR CORD Sign is seen in? \nSelect and explain. \nA. Caroli's Disease, B. Serous Cystadenoma, C. Biliary Atresia, D. Hydatid of Liver", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Biliary atresia: Has empty GB fossa / Ghost gall bladder "Triangular cord sign "is seen. Triangular cord sign represents the fibrous ductal remnant of the extrahepatic bile duct in biliary atresia. Carolis disease: It is a type V choledochal cyst - Intrahepatic biliary dilatation Shows "central dot sign" Hydatid of Liver Serous cystadenomas of pancreas: - demonstrates multicystic, lobulated mass in head of pancreas - characterised by centrally enhancing scar showing stellate calcification -\'bunch of grapes appearance\' is seen on axial T2 MRI image.', 'role': 'assistant'}]