## **Core Concept**
The question tests understanding of viral genomes, specifically focusing on the sense of nucleic acid. Viruses can have either DNA or RNA genomes, and these genomes can be single-stranded or double-stranded. The sense of the nucleic acid refers to whether it can directly serve as messenger RNA (mRNA) to be translated into proteins. Positive-sense nucleic acid genomes can directly act as mRNA.

## **Why the Correct Answer is Right**
The correct answer, , implies that the virus has a positive-sense single-stranded RNA genome. Positive-sense RNA viruses have genomes that can be directly translated into proteins by the host cell's machinery. This is because their RNA is equivalent to mRNA and can bind to ribosomes to initiate protein synthesis. Examples of positive-sense RNA viruses include the Hepatitis C virus, Coronavirus, and Picornaviruses.

## **Why Each Wrong Option is Incorrect**
- **Option A:** - This option is incorrect because it does not specify a type of virus or genetic material known for having a positive-sense nucleic acid genome.
- **Option B:** - This option is incorrect because it suggests a double-stranded DNA virus, which does not have a positive-sense single-stranded RNA genome.
- **Option D:** - This option is incorrect because it implies a negative-sense single-stranded RNA genome, which needs to be transcribed into a positive-sense RNA before translation into proteins.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that positive-sense RNA viruses can cause a wide range of diseases, from the common cold (Picornaviruses) to severe diseases like Hepatitis C. Understanding the type of genetic material a virus has can provide clues about its replication strategy and potential targets for antiviral therapy.

## **Correct Answer:** .