This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Most common cause of death in primary amyloidosis is \nSelect and explain. \nA. Respiratory failure, B. Renal failure, C. Cardiac failure, D. Septicemia', 'role': 'user'}, {'content': "Answer: C \nExplanation: Primary amyloidosis: (light chain amyloidosis or AL-amyloid disease)Primarily a consequence of plasma cell disordersThe kidney is the most frequently involved organ(80%)Hea is second most frequently involved(40%)Cardiac failure is the most common cause of deathCardiac amyloidosis mostly manifests as restrictive cardiomyopathy(ref: Harrison's 18/e p948)", 'role': 'assistant'}]