**Core Concept**
Alpha-1-antitrypsin deficiency is a genetic disorder characterized by the deficiency of alpha-1-antitrypsin (A1AT), a protease inhibitor produced in the liver. This deficiency can lead to the accumulation of abnormal A1AT protein in the liver, causing chronic liver disease and emphysema.

**Why the Correct Answer is Right**
Option B (emphysema) is correct because alpha-1-antitrypsin deficiency can lead to premature destruction of lung tissue, resulting in emphysema. Option C (fibrosis of Portal tract) is correct because the accumulation of abnormal A1AT protein in the liver can cause fibrosis and cirrhosis, particularly in the portal tracts. Option D (diastase resistant positive hepatocytes) is correct because the abnormal A1AT protein can accumulate in hepatocytes, making them resistant to diastase digestion.

**Why Each Wrong Option is Incorrect**
**Option A:** Autosomal dominant disease - Incorrect because alpha-1-antitrypsin deficiency is an autosomal co-dominant disorder, meaning that an individual inherits two copies of the mutated gene, one from each parent. **Option E:** Orcein positive granules - Incorrect because orcein staining is typically used to identify alpha-1-antitrypsin inclusions in hepatocytes, but the presence of these inclusions is not a defining characteristic of the disease.

**Clinical Pearl / High-Yield Fact**
Alpha-1-antitrypsin deficiency can be diagnosed by identifying the abnormal A1AT protein in hepatocytes using orcein staining or by genetic testing. Early diagnosis and treatment can help prevent the progression of liver disease and emphysema.

**✓ Correct Answer: C. bcd. Emphysema, Fibrosis of Portal tract, Diastase resistant positive hepatocytes.**