This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'True about central nystagmus is \nSelect and explain. \nA. Changing direction, B. Not suppressed by optic fixation, C. Horizontal or veical, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Nystagmus is central when the lesion is in the central neural pathways. It cannot be suppressed by optic fixation. The direction of nystagmus is changing and is non-fatiguable. (Ref: Diseases of EAR, NOSE AND THROAT by PL DHINGRA - 6th Edition)', 'role': 'assistant'}]