question: Q:A 23-year-old woman comes to the physician because of an 8-month history of weakness and intermittent burning pain in her neck, shoulders, and arms. She was involved in a motor vehicle collision 1 year ago. Examination of the upper extremities shows absent reflexes, muscle weakness, and fasciculations bilaterally. Sensation to temperature and pain is absent; vibration and proprioception are preserved. The pupils are equal and reactive to light. Which of the following is the most likely diagnosis?? 
  {'A': 'Tabes dorsalis', 'B': 'Syringomyelia', 'C': 'Subacute combined degeneration', 'D': 'Amytrophic lateral sclerosis', 'E': 'Cervical disk prolapse'},