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 35 year old insulin dependent diabetes mellitus (IDDM) patient on Insulin for the past 10yrs complains of gradually progressive painless loss of vision. Most likely he has: \nSelect and explain. \nA. Cataract., B. Vitreous haemorrhage, C. Total rhegmatogenous retinal detachment, D. Tractional retinal detachment not involving the macula', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Tractional Retinal detachment not involving the macula', 'role': 'assistant'}]