Smallest DNA virus is?
**Core Concept**
The question is testing the student's knowledge of the smallest DNA viruses, which have significant implications in the field of virology and molecular biology. These viruses have the smallest genome size, making them an essential area of study for understanding the fundamental principles of viral replication and pathogenesis.
**Why the Correct Answer is Right**
The correct answer is **B. Papovavirus**. The Papovaviridae family, which includes Papilloma viruses and Polyoma viruses, comprises some of the smallest DNA viruses known. These viruses have a genome size of approximately 5 kilobases, making them the smallest DNA viruses. The Papovavirus genome encodes for a limited number of genes, which are essential for viral replication and transcription.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a particular type of DNA virus. While some viruses may have a smaller genome size, this option is too vague and does not provide a clear answer.
**Option C:** This option is incorrect because it refers to a type of RNA virus, not a DNA virus. The Coronaviridae family includes viruses such as SARS-CoV and MERS-CoV, which have a larger genome size compared to DNA viruses.
**Clinical Pearl / High-Yield Fact**
Remember that the smallest DNA viruses have a significant impact on human health, with Papilloma viruses being associated with various types of cancer, including cervical cancer.
**Correct Answer:** B. Papovavirus