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
A diabetic patient is undergoing dialysis. Aspiration done around the knee joint would show which of the following? 
Select and explain. 
A. A- b2 microglobulin, B. AA, C. AL, D. Lactoferrin
A: A- b2 microglobulin
Answer: A: A- b2 microglobulin 
Explanation: Chronic renal failure patients undergoing long term hemodialysis develop amyloidosis. Amyloidosis in such cases is associated with the deposition of a protein called A- b2 microglobulin. Such amyloid deposits are common in synovium, joints and tendon sheaths. So an aspirate obtained from knee joint would likely reveal A- b2 microglobulin.Ref: Pathologic Basis Of Disease, Robbins, 6th Edition, Page 253; 7th Edition, Page 260, 261.