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
[{'content': "Bence - Jones are laboratory finding of \nSelect and explain. \nA. Paget's disease, B. Multiple myeloma, C. Malignant melanoma, D. Fibrous dysplasia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]