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: Anatomy
[{'content': 'Most common site of metastasis in cholangiocarcinoma \nSelect and explain. \nA. Liver, B. Bones, C. Lung, D. Pancreas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Distant metastasis occurs in one third of patients Most common site is liver, lung or mediastinum, peritoneum Ref: Sabiston 20th edition Pgno :1514-1518', 'role': 'assistant'}]