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': 'The etiology of amyloidosis is - \nSelect and explain. \nA. Automimmune, B. T-cell mediated, C. B cell mediated, D. Unknown', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Unknown", 'role': 'assistant'}]