Which of the following is a B1 hepatic disease?

• A. Gilbert Syndrome
• B. DJS
• C. Rotor Syndrome
• D. Hepatitis

Answer: (A)

This item emphasizes distinguishing a mild inherited form of bilirubin handling from liver diseases that show more evident liver injury. Gilbert syndrome is a small, benign reduction in the hepatic enzyme activity that conjugates bilirubin (UDP-glucuronosyltransferase). Because of this slight deficiency, unconjugated bilirubin can rise, especially during fasting, illness, or stress, but liver function tests stay normal and there’s no real liver damage. That profile—episodic, mild unconjugated jaundice with otherwise normal liver enzymes—fits a B1 hepatic disease as a harmless, inherited bilirubin processing issue.

In contrast, the other conditions involve different patterns. Dubin-Johnson and Rotor syndromes also cause jaundice but with conjugated (direct) hyperbilirubinemia due to impaired excretion of bilirubin from liver cells; their bilirubin pattern is different from the unconjugated rise seen in Gilbert. Hepatitis is an inflammatory liver disease with hepatocellular injury, typically marked by elevated liver enzymes and potential systemic symptoms, which is not the same benign unconjugated hyperbilirubinemia described here.