<prompt> Cataract in a diabetic patients is because of accumulation of sorbital in lens. The enzyme responsible for this isHexokinaseNADPH dependant aldolase reductaseGlucokinasePhosphofructo isomerase  <response>: B i.e. NADPH dependent aldolase reductase Lens Q, peripheral nerves, renal glomeruli RBCs are the tissues where glucose can enter without the help of insulin. In diabetics, concentration of glucose rise with in lens which is conveed into sorbitol fructose. Sorbitol does not easily diffuse through cell membrane thus accumulate. It causes damage to lens protein and leads to cataract. 