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
"Egg shell" calcification in hilar nodes suggest: 
Select and explain. 
A. Asbestosis, B. Post irradiation lymphoma, C. Berylliosis, D. Baritosis Bookma
B: Post irradiation lymphoma
Answer: B: Post irradiation lymphoma 
Explanation: Post irradiation lymphoma