This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder, Subject name: Medicine
[{'content': 'Which of the following is a diagnosis? \nSelect and explain. \nA. Klatskin tumor, B. Carolicyts, C. Bryler disease, D. Primary sclerosing cholangitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Klatskin tumor.Imagesource- style="font-family: Times New Roman, Times, serif">', 'role': 'assistant'}]