**Core Concept:** Sterilization is the process of destroying or inactivating all forms of microorganisms, such as bacteria, viruses, fungi, and spores. In the context of dusting powder, sterilization is essential to prevent transmission of pathogens and infections.

**Why the Correct Answer is Right:** The correct method of sterilizing dusting powder involves heat treatment, specifically autoclaving, which is a process of applying high pressure and temperature to inactivate microorganisms effectively. This process ensures the safety and sterility of the product for use in healthcare settings and households.

**Why Each Wrong Option is Incorrect:**

A. **Boiling:** Boiling is insufficient for sterilization as it only reaches temperatures up to around 100°C, which is not enough to completely kill all microorganisms.

B. **UV Light Sterilization:** Ultraviolet (UV) light sterilization is not suitable for dusting powder as it requires direct exposure to UV light, which is not practical for a liquid or solid product like dusting powder.

C. **Freezing:** Freezing at low temperatures does not guarantee sterilization as some microorganisms can survive and grow under these conditions.

D. **Soap and Water:** Soap and water are not adequate for sterilization as they primarily remove dirt and grease, but cannot effectively inactivate microorganisms.

**Clinical Pearl:** For practical sterilization of dusting products, autoclaving is the most reliable method. In healthcare settings, autoclaving should be performed at 121°C for 15 minutes (at 15 lbs/in² pressure). In household settings, autoclaving at 121°C for 15 minutes ensures the safety of dusting products from microbial contamination.