**Core Concept:** Good Pasture Syndrome (GPS) is an autoimmune disease where antibodies against the glomerular basement membrane (GBM) cause a form of rapidly progressive glomerulonephritis. The syndrome is named after the Australian paediatrician, Bernard Good, and the New Zealand veterinarian, John Pasture, who first described the syndrome in 1959 in sheep.

**Why the Correct Answer is Right:** In Good Pasture Syndrome, antibodies against the GBM are directed against the alpha-3 chain of type IV collagen. This results in the destruction of the GBM and subsequent inflammation of the glomerulus. The antibodies cause a form of rapidly progressive glomerulonephritis, which leads to the clinical manifestations of the disease. This autoimmune response primarily affects the kidneys, but can also affect the lungs.

**Why Each Wrong Option is Incorrect:**
A. Kidney (renal) involvement is correct, but the question asks about pulmonary involvement.
B. Lung involvement is correct, but the focus of the question is on the kidney.
C. Kidney involvement is correct, but the question asks about pulmonary involvement.
D. Lung involvement is incorrect, as the correct answer is B.

**Clinical Pearl / High-Yield Fact:** Gastrointestinal symptoms can also be present in Good Pasture Syndrome due to the involvement of the renal and pulmonary system. This highlights the importance of considering the syndrome in patients with rapidly progressive glomerulonephritis and pulmonary dysfunction, as it is a rare but treatable cause of these symptoms.