**Core Concept**
The underlying principle being tested is the proper handling and disposal of potentially infectious medical waste, specifically in the context of an HIV-positive patient. This involves understanding of **infection control** measures and **biohazard disposal** protocols.

**Why the Correct Answer is Right**
The correct method of choice for discarding the dressing involves treating it as **biohazardous waste** due to the potential presence of HIV. This typically involves placing the dressing in a puncture-proof container that is leak-resistant and has a secure lid, often lined with a plastic bag to prevent leakage. The container is then sealed and disposed of according to the facility's **infection control** policies, which may include autoclaving or incineration.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because simply throwing the dressing away does not adhere to biohazardous waste disposal protocols.
**Option B:** Incorrect as it does not specify the use of a biohazard container.
**Option C:** Incorrect because it may not be the standard procedure for disposing of biohazardous materials in all settings.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that all bodily fluids from HIV-positive patients should be treated as potentially infectious. Always wear **personal protective equipment (PPE)** when handling such materials, and follow the facility's guidelines for **biohazard disposal**.

**Correct Answer:** D. Dispose of the dressing in a biohazard container.