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: Medicine
[{'content': 'All of the following are characterized by upper lobe Fibrosis except \nSelect and explain. \nA. Silicolis, B. Busulphan, C. Cystic Fibrosis, D. Histoplasmosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Busulphan causes lower lobe fibrosis.', 'role': 'assistant'}]