This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'All of the following organs contain aneurysm in polyarteritis nodosa except ? \nSelect and explain. \nA. Liver, B. Lung, C. Kidney, D. Pancreas', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]