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': 'Characteristic radiological finding in sarcoidosis \nSelect and explain. \nA. Parenchymal disease, B. Bilateral hilar lymphadenopathy, C. Unilateral hilar lymphadenopathy, D. Miliary shadow', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]