<prompt> Which of the following is characterstic sign of diabetic retinopathy?Increase in pericytesThinned out capillary basement membraneLipohyaline depositsProliferation of endothelial cells  <response>: The pathogenesis of Diabetic retinopathy is microangiopathy which occurs due to microvascular occlusion leakage. There is degeneration and loss of pericytes in capillaries-- microvascular proliferation of endothelial cells --thickening of basement membrane--narrowed lumen of vessels. 