**Core Concept**
Autoclaving is a widely used method for sterilization in healthcare settings, involving high-pressure steam to kill microorganisms. This process is effective against most forms of microbial life, including bacteria, viruses, and fungi. However, autoclaving can be less effective or even damage certain materials.

**Why the Correct Answer is Right**
Autoclaving can be detrimental to materials like glass bead sterilizers, certain plastics, and some types of rubber. The high-pressure steam can cause these materials to degrade or become brittle. Additionally, autoclaving can also damage or destroy some biological materials, such as enzymes, proteins, or DNA. This is because the high heat and pressure can denature or break down these sensitive molecules.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because autoclaving is commonly used for sterilizing equipment and supplies, including glassware, metal instruments, and plastic equipment.
* **Option B:** This option is incorrect because autoclaving is effective against a wide range of microorganisms, including bacteria, viruses, and fungi.
* **Option D:** This option is incorrect because autoclaving is a widely accepted method for sterilizing medical equipment, including instruments and supplies.

**Clinical Pearl / High-Yield Fact**
When using autoclaving for sterilization, it's essential to ensure that the equipment or materials being sterilized are compatible with the high-pressure steam. This includes using the correct type of autoclave, following proper protocols, and monitoring the sterilization process to avoid damaging sensitive materials.

**Correct Answer: C. Certain plastics and rubber materials.**