Final answer:
Recovery from nephrotic syndrome is indicated by the disappearance of protein from the urine, as this suggests the kidneys are healing and regaining the ability to retain proteins like albumin. The correct option is A.
Step-by-step explanation:
Recovery in a patient with nephrotic syndrome is indicated by a disappearance of protein from the urine. During nephrotic syndrome, damage to the glomeruli allows proteins such as albumin to leak into the urine, which is known as proteinuria. As the kidney heals and function improves, protein stops spilling into the urine, signaling a recovery from nephrotic syndrome. Therefore, the correct answer is A. Disappearance of protein from the urine. The glomerulus is damaged, allowing a large amount of protein in the blood to enter the urine. When the glomerulus recovers, the protein is no longer excreted in the urine, indicating improvement in kidney function.