**Core Concept:** Antibodies targeting basement membranes can lead to autoimmune diseases like Goodpasture's syndrome, which presents with hemoptysis (coughing up blood) and hematuria (presence of blood in urine). Basement membranes are thin, protein-rich structures that separate different cell types in various organs, providing structural support and regulating cell behavior.

**Why the Correct Answer is Right:** The correct answer, D, refers to Goodpasture's syndrome, a rare autoimmune disease that occurs when the patient's immune system mistakenly attacks the basement membranes of the kidneys and alveoli (air sacs) in the lungs. The autoantibodies produced by the immune system bind to these basement membranes, causing inflammation and damage. This leads to the clinical symptoms of hemoptysis and hematuria.

**Why Each Wrong Option is Incorrect:**

A. Membranous glomerulonephritis (MGN) is another autoimmune disease that affects kidney's glomeruli (small blood vessels) and presents with hematuria and proteinuria (excessive protein in urine). However, it does not involve the lungs, making it an incorrect option.

B. Immune complex-mediated glomerulonephritis is another autoimmune disease affecting kidney's glomeruli, but it presents with nephrotic syndrome (edema, hypoalbuminemia, and hyperlipidemia) along with hematuria and proteinuria. This option is also incorrect as it does not involve the lungs.

C. Membranoproliferative glomerulonephritis involves both glomeruli and tubules in the kidneys, causing hematuria, proteinuria, and hypertension (high blood pressure). It is also unrelated to the lungs, making it an incorrect option.

**Clinical Pearl:** Goodpasture's syndrome is a rare but severe complication of smoking, with a higher prevalence in heavy smokers. Its diagnosis is often challenging due to its nonspecific presentation and requires high clinical suspicion. Early management is crucial to prevent end-stage renal disease (kidney failure) and pulmonary hemorrhage (lung bleeding). Treatment involves corticosteroids, cyclophosphamide, and plasmapheresis (a procedure to remove harmful substances from the blood).