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': 'A 40 year old male with diabetes presents with vitreous hemorrhage. What is the cause ? \nSelect and explain. \nA. Posterior retinal detachment, B. Neovascularization at disc, C. Central retinal vein occlusion, D. Trauma to central retinal artery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This patient is likely to have proliferative diabetic retinopathy in which neovascularization is the hallmark.\nNeovessels along with fibrous tissue may lie flat on the retina or attach itself to the posterior vitreous face leading later to vitreous face leading later to vitreous traction, retinal separation and the tearing of blood vessels.\nThis is the commonest cause of spontaneous vitreous haemorrhage in adults.', 'role': 'assistant'}]