question: Q:A 50-year-old man comes to the emergency department for evaluation of right-sided facial weakness that he noticed after waking up. One month ago, he also experienced right-sided neck pain and headache that began after returning from a hunting trip to New Hampshire the week before. He took ibuprofen to relieve symptoms, which subsided a week later. He has a 5-year history of hypertension controlled with drug therapy. He has smoked one pack of cigarettes daily for 35 years and he drinks two beers daily. His vital signs are within the normal range. Physical examination shows right-sided drooping of the upper and lower half of the face. The patient has difficulties smiling and he is unable to close his right eye. The remainder of the examination shows no abnormalities. Which of the following is the most appropriate next step in diagnosis?? 
  {'A': 'Western blot', 'B': 'Polymerase chain reaction of the facial skin', 'C': 'Cerebrospinal fluid analysis', 'D': 'Enzyme‑linked immunosorbent assay', 'E': 'Noncontrast CT'},