This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
[{'content': 'A 60 years old chronic smoker presented with jaundice, anorexia and weight loss. ERCP was done. The diagnosis on the basis of ERCP findings: \nSelect and explain. \nA. Choledochal cyst, B. Cholangiocarcinoma, C. Carcinoma pancreas, D. Chronic pancreatitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The image shows double duct sign, which is characteristic of carcinoma head of pancreas. Radiological signs of Ca PANCREAS Double contour of medial border of duodenal C loop Double duct sign -CA head of pancreas. Dilated/ Widening of duodenal C loop Mucosal irregularity Scrambled egg appearance Inveed / reverse 3 sign of Frostberg. Rose thorning of medial wall of 2nd pa of duodenum. (Ampullary carcinoma) Ca head of pancreas - 3 signs Double Duct Reverse 3 sign of Frostberg Antral pad sign', 'role': 'assistant'}]