question: Q:A previously healthy 82-year-old man dies in a motor vehicle collision. At autopsy, the heart shows slight ventricular thickening. There are abnormal, insoluble aggregations of protein filaments in beta-pleated linear sheets in the ventricular walls and, to a lesser degree, in the atria and lungs. No other organs show this abnormality. Bone marrow examination shows no plasma cell dyscrasia. The abnormal protein aggregations are most likely composed of which of the following?? 
  {'A': 'Natriuretic peptide', 'B': 'Normal transthyretin', 'C': 'Immunoglobulin light chain', 'D': 'Serum amyloid A', 'E': 'β-amyloid peptide\n"'},