**Core Concept:** Sterilization and disinfection are two different processes that ensure infection control in healthcare settings. Sterilization involves eliminating all forms of life, including bacteria, viruses, and spores, while disinfection targets pathogenic microorganisms. Sterilization is usually achieved by high-temperature methods like autoclaving, while disinfection can be done using chemicals, radiation, or high-level disinfection methods.

**Why the Correct Answer is Right:** In this case, the correct answer is D - **Dry Heat Sterilization**. Dry heat sterilization, also known as autoclaving, is a process that involves exposing objects to high temperatures and pressures, typically around 121°C (250°F) and 15 lb/in² (1 atm), respectively. This extreme environment kills all forms of life, including bacteria, viruses, and spores, ensuring complete sterilization.

**Why Each Wrong Option is Incorrect:**

A. **Steam Sterilization (Autoclaving)** - This option is incorrect because it is the correct answer, D.

B. **Chemical Sterilization** - This option is incorrect because chemical sterilization typically involves the use of harsh chemicals and is not the primary method used for blood spills.

C. **Radiation Sterilization** - This option is incorrect because radiation sterilization is not often used for blood spills due to its limitations in penetrating deep tissues and maintaining sterility in complex structures.

**Clinical Pearls:**

1. Sterilization is essential for medical equipment and instruments to prevent infections and disease transmission.
2. For blood spills, high-level disinfection methods are preferred, such as autoclaving, to ensure the destruction of pathogens, spores, and blood components.
3. In some cases, cold sterilization methods like irradiation may be used, but these are not typically employed for blood spills due to their limitations. 4. Always ensure that the correct method is chosen based on the type and nature of the materials being treated.