Which of the following hepatitis viruses is NOT an RNA virus? (Identify the DNA virus among common hepatitis agents.)

Introduction: Most hepatitis viruses are RNA viruses, but one major exception exists. This question tests recognition of the unique nucleic acid type that distinguishes hepatitis B virus (HBV) from other hepatitis agents.

Given Data / Assumptions:

• HAV, HEV, and HGV (GB virus C) are RNA viruses.
• HBV belongs to the Hepadnaviridae family and possesses DNA.
• Classification is based on genome type, not clinical syndrome severity.

Concept / Approach: HBV contains a partially double-stranded, circular DNA genome and replicates via reverse transcription. In contrast, HAV (Picornaviridae), HEV (Hepeviridae), and HGV/GBV-C (Flaviviridae-related) carry single-stranded RNA genomes.

Step-by-Step Solution: List genome types for each candidate. Single out the DNA-containing virus (HBV). Confirm others are RNA viruses. Choose the only non-RNA option.

Verification / Alternative check: Standard virology references classify HBV as a DNA virus with reverse transcriptase activity.

Why Other Options Are Wrong:

• Hepatitis A / E / G: All are RNA viruses.

Common Pitfalls: Confusing replication via reverse transcriptase (seen in HBV) with RNA genome possession; HBV is still a DNA virus.

Final Answer: Hepatitis B virus is not an RNA virus.