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
Hemodialysis associated amyloid is: 
Select and explain. 
A. Beta 2 microglobulin, B. AA, C. AL, D. ATTR
A: Beta 2 microglobulin
Answer: A: Beta 2 microglobulin 
Explanation: Patients on long term hemodialysis for renal failure develop amyloidosis due to deposition of b2 microglobulin. Ref: Robbin's Illustrated Pathology, 7th Edition, Pages 260-61; Complications of Dialysis By Norbe Lameire, Ravindra L. Mehta, Page 352