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': 'Bone marrow in Amyloid Lightchain Amyloidosis shows which of the following features? \nSelect and explain. \nA. Bone marrow plasmacytosis, B. Granulomatous reaction, C. Fibrosis, D. Giant cell formation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Amyloid light chain (AL) protein is derived from plasma cells. All patients with AL amyloidosis have increased plasma cells in their bone marrow presumably accounting for the production of precursors of AL protein. Ref: Pathologic Basis of Disease, Robbins, 6th Edition, Page 253; 7th Edition, Page 261', 'role': 'assistant'}]