Which of the following is an RNA virus?
**Core Concept**
The question tests the student's knowledge of the classification of viruses based on their genetic material, specifically the distinction between RNA and DNA viruses. This is a fundamental concept in virology, essential for understanding viral replication, transmission, and disease pathogenesis.
**Why the Correct Answer is Right**
RNA viruses are a diverse group of pathogens that include many significant human and animal pathogens. They replicate their genetic material using RNA-dependent RNA polymerase, which is essential for their replication and transmission. The correct answer is a member of this group, characterized by its RNA genome.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because this virus is a DNA virus, belonging to the family Herpesviridae.
**Option B:** Incorrect because this virus is a DNA virus, belonging to the family Poxviridae.
**Option C:** Incorrect because this virus is a DNA virus, belonging to the family Papovaviridae.
**Clinical Pearl / High-Yield Fact**
RNA viruses are highly mutable, which facilitates their rapid evolution and adaptation to changing environments. This property contributes to their ability to cause significant disease outbreaks and pandemics.
**Correct Answer: C. Influenza virus**