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': 'All of the following findings are associated with optic neuritis except \nSelect and explain. \nA. Painful ocular movements, B. Defective color perception, C. Defective depth perception, D. Metamorphopsia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Defective depth perception - pulfrichphenomeron.\nMetamorphopsia not associated with optic neuritis.', 'role': 'assistant'}]