question: Q:A 33-year-old woman with a history of multiple sclerosis is brought to the physician because of dizziness, urinary incontinence, loss of vision in her right eye, and numbness and weakness of the left leg. She has had recurrent episodes of neurological symptoms despite several changes in her medication regimen. An MRI of the brain shows several new enhancing lesions in the periventricular white matter and the brainstem. Treatment with a drug that binds to CD52 is initiated. Which of the following agents was most likely prescribed?? 
  {'A': 'Eculizumab', 'B': 'Bevacizumab', 'C': 'Alemtuzumab', 'D': 'Rituximab', 'E': 'Abciximab'},