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: Pathology
Egg shell calcification of Hilar Lymphnode is associated with 
Select and explain. 
A. Silicosis, B. Asbestosis, C. Byssinosis, D. Anthracosis
A: Silicosis
Answer: A: Silicosis 
Explanation: None