question: Q:A 29-year-old man comes to the emergency department because of progressively worsening fatigue and shortness of breath for the past 2 weeks. His only medication is insulin. Examination shows elevated jugular venous distention and coarse crackles in both lungs. Despite appropriate life-saving measures, he dies. Gross examination of the heart at autopsy shows concentrically thickened myocardium and microscopic examination shows large cardiomyocytes with intracellular iron granules. Examination of the spinal cord shows atrophy of the lateral corticospinal tracts, spinocerebellar tracts, and dorsal columns. Which of the following is the most likely underlying cause of this patient's condition?? 
  {'A': 'SOD1 gene mutation on chromosome 21', 'B': 'CTG trinucleotide repeat expansion on chromosome 19', 'C': 'Dystrophin gene mutation on the X chromosome', 'D': 'GAA trinucleotide repeat expansion on chromosome 9', 'E': 'SMN1 gene mutation on chromosome 5'},