question: Q:A 55-year-old man with a history of repeated hospitalization for chronic pancreatitis comes to the physician because of difficulty walking and standing steadily. Neurological examination shows an unsteady, broad-based gait, distal muscle weakness, decreased deep tendon reflexes, and an abnormal Romberg test. His hemoglobin concentration is 11.9 g/dL, mean corpuscular volume is 89/μm3, and serum lactate dehydrogenase is 105 U/L. His serum haptoglobin is slightly decreased. A deficiency of which of the following substances is the most likely cause of this patient's findings?? 
  {'A': 'Tocopherol', 'B': 'Folate', 'C': 'Pyridoxine', 'D': 'Niacin', 'E': 'Phytomenadione'},