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: Pathology
[{'content': 'Cholangio carcinoma of liver caused by \nSelect and explain. \nA. Hepatitis B infection, B. Cirrhosis of liver, C. Alpha - feto protein, D. Clonorchis sinensis infection', 'role': 'user'}, {'content': 'Answer: D \nExplanation: risk factor of cholangio carcinoma includes Primary sclerosis cholangitis Fibropolypocystic disease of biliary tree Infestation by Clonorchis sinensis or Opisthorchis viverrini. ROBBINS BASIC PATHOLOGY NIanTH EDITION PAGE 643', 'role': 'assistant'}]