question: Q:A previously well 25-year-old woman was brought to the emergency department by her boyfriend because of progressive blurred vision. Examination of the eyes reveals loss of horizontal gaze, intact convergence, and nystagmus. A clinical diagnosis of multiple sclerosis is made and the patient is started on a course of corticosteroids. What is the most likely etiology for her eye examination findings?? 
  {'A': 'Loss of reticular formations', 'B': 'Loss of frontal eye fields', 'C': 'Loss of bilateral medial longitudinal fasciculus', 'D': 'Loss of cranial nerve III', 'E': 'Loss of cranial nerve VI'},