**Core Concept**
Viruses are obligate parasites that can contain either DNA or RNA as their genetic material. Some viruses possess both DNA and RNA, but this is not a universal characteristic among all viruses. The presence of both DNA and RNA can be due to various mechanisms such as reverse transcription or the presence of a viral genome that contains both DNA and RNA.

**Why the Correct Answer is Right**
The correct answer is the option that does not possess both DNA and RNA. This could be due to various reasons such as the virus having a single-stranded RNA genome or a double-stranded DNA genome. For example, the human immunodeficiency virus (HIV) is a retrovirus that contains a single-stranded RNA genome and does not possess both DNA and RNA.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it is not a valid answer choice.
* **Option B:** This option is incorrect as it is not a virus that possesses both DNA and RNA.
* **Option C:** This option is incorrect as it is not a virus that possesses both DNA and RNA.
* **Option D:** This option is incorrect as it is not a virus that possesses both DNA and RNA.

**Clinical Pearl / High-Yield Fact**
It is essential to note that some viruses can have complex genomes that contain both DNA and RNA, and this can be due to various mechanisms such as reverse transcription or the presence of a viral genome that contains both DNA and RNA.

**Correct Answer:** D.