A 44 year old man presents with periorbital and pedal edema. 24h urine shows 8g of protein/d and serum cholesterol 7mmol/L. Renal biopsy results are awaited. What would be the most likely diagnosis?

The given key is C. Membranous glomerulonephritis. [This is nephrotic syndrome. It is characterized by proteinuria more than 3gm/24hours, low albumin, edema and high cholesterol. Most common causes of nephrotic syndrome in adults are membranous glomerulonephropathy and FSGS (focal segmental glomerulosclerosis)].