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
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: 
Select and explain. 
A. Cataract., B. Vitreous haemorrhage, C. Total rhegmatogenous retinal detachment, D. Tractional retinal detachment not involving the macula
D: Tractional retinal detachment not involving the macula
Answer: D: Tractional retinal detachment not involving the macula 
Explanation: D i.e. Tractional Retinal detachment not involving the macula