question: Q:A 75-year-old man is brought to the emergency room after being found unconscious in his home. His medical history is unknown. On physical examination he does not demonstrate any spontaneous movement of his extremities and is unable to respond to voice or painful stimuli. You notice that he is able blink and move his eyes in the vertical plane. Based on these physical exam findings, you expect that magnetic resonance angiogram will most likely reveal an occlusion in which of the following vessels?? 
  {'A': 'Anterior cerebral artery', 'B': 'Anterior spinal artery', 'C': 'Anterior inferior cerebellar artery', 'D': 'Basilar artery', 'E': 'Posterior cerebral artery'},