**Core Concept**
The question is testing the student's knowledge of viral structure and replication. RNA-dependent DNA polymerase, also known as reverse transcriptase, is an enzyme that synthesizes DNA from an RNA template. This is a key feature of retroviruses, which replicate by converting their single-stranded RNA genome into double-stranded DNA.

**Why the Correct Answer is Right**
The correct answer is a type of retrovirus that contains reverse transcriptase as a structural component of the virion. During replication, the reverse transcriptase enzyme reads the viral RNA genome and synthesizes a complementary DNA copy, which is then integrated into the host cell genome. This process allows the virus to hijack the host cell's machinery and replicate itself.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not contain a RNA-dependent DNA polymerase. While some viruses may have enzymes that synthesize DNA from RNA, they do not contain a reverse transcriptase as a structural component of the virion.

**Option B:** This option is incorrect because it is not a type of retrovirus. While some viruses may have DNA genomes, they do not contain a reverse transcriptase enzyme as a structural component of the virion.

**Option C:** This option is incorrect because it is not a type of retrovirus. While some viruses may have RNA genomes, they do not contain a reverse transcriptase enzyme as a structural component of the virion.

**Clinical Pearl / High-Yield Fact**
Retroviruses, such as HIV, can be treated with reverse transcriptase inhibitors, which block the action of the reverse transcriptase enzyme and prevent viral replication. These inhibitors are an important component of antiretroviral therapy for HIV infection.

**Correct Answer: C. Retroviruses.**