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': 'Which of the following is associated with Bence jones myeloma \nSelect and explain. \nA. y chain disease, B. a chain disease, C. X, chain disease, D. t chain disease', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., chain disease", 'role': 'assistant'}]