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
Following is the cause for sudden loss of vision in diabetic patient: 
Select and explain. 
A. Central material aery block, B. Vitreous haemorrhage, C. Tractional retinal detachment, D. Neovascular glaucoma
B: Vitreous haemorrhage
Answer: B: Vitreous haemorrhage 
Explanation: Vitreous haemorrhage