<prompt>  A 26-year-old woman with multiple sclerosis comes to the physician because of a recent relapse Examination of the eye movements shows slow adduction of the left eye with an associated right-beating nystagmus in the right eye. Which of the following is the location of the pathology that underlies this abnormality?Abducens nerve palsyLeft medial longitudinal fasciculusRight medial longitudinal fasciculusRight oculomotor nerve 