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 lymph nodes is seen ina) Sarcoidosisb) Histoplasmosisc) Tuberculosisd) Carcinoma lunge) Silicosis \nSelect and explain. \nA. bcde, B. abcd, C. abce, D. abde', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]