question: Q:A 38-year-old woman presents to her primary care physician for evaluation of 3 months of increasing fatigue. She states that she feels normal in the morning, but that her fatigue gets worse throughout the day. Specifically, she says that her head drops when trying to perform overhead tasks. She also says that she experiences double vision when watching television or reading a book. On physical exam, there is right-sided ptosis after sustaining upward gaze for a 2 minutes. Which of the following treatments may be effective in treating this patient's diagnosis?? 
  {'A': 'Antitoxin', 'B': 'Chemotherapy', 'C': 'Riluzole', 'D': 'Thymectomy', 'E': 'Vaccination'},