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 of lymphnodes is suggestive of 
Select and explain. 
A. Asbestosis, B. Berylliosis, C. Stannosis, D. Coal worker pneumoconiosis
D: Coal worker pneumoconiosis
Answer: D: Coal worker pneumoconiosis 
Explanation: Silicosis & Coalworker Pneumoconiosis are important cause.