**Core Concept**
Obstructive jaundice results from blockage of bile ducts, leading to impaired bile flow and accumulation of conjugated bilirubin in the blood. This type of jaundice is characterized by elevated conjugated bilirubin, not unconjugated bilirubin.

**Why the Correct Answer is Right**
In obstructive jaundice, bile duct obstruction prevents conjugated bilirubin from entering the intestine. Thus, conjugated bilirubin builds up in the blood, causing hyperbilirubinemia. Unconjugated bilirubin remains low because it is not significantly involved in the obstruction pathway. The clinical features include pruritus (due to bile salts), pale stools (due to lack of bile pigments), and icterus (yellowing of skin and sclera).

**Why Each Wrong Option is Incorrect**
Option B: Pruritus is a hallmark of obstructive jaundice due to accumulation of bile salts in the skin.
Option C: Pale stools occur because bile pigments are not excreted into the gut.
Option D: Icterus (yellowing) is a classic sign of jaundice in obstructive disease.

**Clinical Pearl / High-Yield Fact**
In obstructive jaundice, **conjugated bilirubin is elevated**, while unconjugated bilirubin is normal or low. This distinguishes it from hemolytic jaundice, where unconjugated bilirubin is high.

✓ Correct Answer: A. Unconjugated bilirubin