This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
In systemic senile amyloidosis there is deposition of? 
Select and explain. 
A. AA, B. AL, C. Beta - 2- microglobulin, D. ATTR
D: ATTR
Answer: D: ATTR 
Explanation: Ans. is 'd' i.e., ATTR Important systemic amyloidosisAmyloid proteinPrecursorSyndrome or involved tissueALImmunoglobulin light chainPrimary Myeloma associatedAASerum AA (SAA)Reactive, chronic inflammatory conditionA b2mb2 microglobulinHemodialysisAASAAFamilial mediterranean feverATTRTransthyretinFamilial amyloidotic polyneuropathiesATTRTransthyretinSystemic senile Amyloidosis (Systemic cardiac Amyloidosis)