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 lymph nodes is seen in : 
Select and explain. 
A. Sarcoidosis, B. Histoplasmosis, C. Tuberculosis, D. Carcinoma lung
B: Histoplasmosis
Answer: B: Histoplasmosis 
Explanation: B i.e. Waterston Cooley's shunt