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: Radiology
[{'content': '"Egg shell" calcification in hilar nodes suggest: \nSelect and explain. \nA. Asbestosis, B. Post irradiation lymphoma, C. Berylliosis, D. Baritosis Bookma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Post irradiation lymphoma', 'role': 'assistant'}]