This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Ophthalmology
[{'content': 'Cause of sudden loss of vision in a diabetic is due to: \nSelect and explain. \nA. Neovascular glaucoma, B. Central retinal aery occlusion, C. Vitreous hemorrhage, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Commonest cause of sudden loss of vision in a diabetic is vitreous hemorrhage Slow loss of vision in a diabetic is due to Cystoid macular edema Neovascular glaucoma', 'role': 'assistant'}]