**Question:** Goodpasture's disease is characterized by all except-

A. Autoimmune response
B. Glomerulonephritis
C. Pulmonary hemorrhage
D. Nephrotic syndrome

**Core Concept:** Goodpasture's disease is a rare autoimmune disorder that involves both the kidney and lungs. It is characterized by the formation of autoantibodies against glomerular basement membrane (GBM) proteins, leading to inflammation, damage, and dysfunction of affected organs.

**Why the Correct Answer is Right:** Goodpasture's disease is indeed characterized by an autoimmune response, which attacks the GBM proteins in the kidneys and lungs. This results in the inflammation, damage, and dysfunction of these organs. Autoimmune response is not a specific feature of Goodpasture's disease, but rather a general description of the underlying mechanism.

**Why Each Wrong Option is Incorrect:**

A. Autoimmune response: As explained above, autoimmune response is a general mechanism and not a specific feature of Goodpasture's disease. In contrast, the correct answer highlights the autoimmune attack on GBM proteins.

B. Glomerulonephritis: Glomerulonephritis refers to inflammation of the glomerulus, which is a specific feature of various kidney diseases. Although Goodpasture's disease can cause glomerulonephritis, it is not the primary characteristic of the disease.

C. Pulmonary hemorrhage: While Goodpasture's disease can lead to pulmonary hemorrhage due to lung involvement, it is not a defining feature of the disease. The correct answer focuses on the autoimmune attack on GBM proteins.

D. Nephrotic syndrome: Nephrotic syndrome is a clinical presentation characterized by proteinuria (excessive protein loss in urine), hypoalbuminemia, hyperlipidemia, and edema. Although Goodpasture's disease can present with nephrotic syndrome, it is not the primary defining feature of the disease. The correct answer highlights the autoimmune attack on GBM proteins.

**Clinical Pearl:** Goodpasture's disease is a rare autoimmune disorder characterized by an autoimmune attack on the glomerular basement membrane (GBM) proteins, leading to inflammation, damage, and dysfunction of the kidneys and lungs. While the disease can present with nephrotic syndrome and pulmonary hemorrhage, these features are not the primary defining features of the disease. The correct answer focuses on the autoimmune attack on GBM proteins.