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': 'Which of the following is a cause of sudden blindness in a quiet eye with a normal media and fundus: September 2009 \nSelect and explain. \nA. Acute retrobulbar neuritis, B. Vitreous hemorrhage, C. Iridocyclitis, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Acute retrobulbar neuritis Conditions which produce visual loss with a normal fundus: Amblyopia Coical blindness Retrobulbar neuritis Cone-rod dystrophy Chiasmal tumour', 'role': 'assistant'}]