This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Most common cause of death in primary amyloidosis is?- 
Select and explain. 
A. Respiratory failure, B. Cardiac failure, C. Renal failure, D. Septicemia
B: Cardiac failure
Answer: B: Cardiac failure 
Explanation: Reference :Robbins basic pathology 9th edition pg no 158: Cardiac arrythmias are an impoant cause of death in Cardiac amyloidosis.in one large series 40% of the patients with AL amyloid died of cardiac disease