question: Q:An 81-year-old man comes to the emergency department because of left-sided visual loss that started 1 hour ago. He describes initially seeing jagged edges, which was followed by abrupt, complete loss of central vision in the left eye. He has hypertension and type 2 diabetes mellitus. Blood pressure is 145/89 mm Hg. Neurologic examination shows no abnormalities. A photograph of the fundoscopic findings is shown. Which of the following tests is most likely to confirm this patient's underlying condition?? 
  {'A': 'Glycated hemoglobin concentration', 'B': 'Carotid artery duplex ultrasonography', 'C': 'Erythrocyte sedimentation rate', 'D': 'CD4+ T-cell count', 'E': 'Optic tonometer'},