This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Disscociated vertical deviation seen in \nSelect and explain. \nA. Vertical on looking up, B. Horizontal on looking in, C. Vertical on looking down, D. Horizontal on looking out', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Diplopia—seeing double—is a symptom with many potential causes, both neurological and .\nThis group of patients may also describe palinopsia—multiple images .\nHowever, other causes of an apparent superior oblique palsy such as .\nThe optokinetic system cannot be properly assessed at bedside because the OKN', 'role': 'assistant'}]