**Core Concept**
Plasma sterilization is a method of sterilization that uses a gas plasma, a high-energy state of matter, to inactivate microorganisms. This process involves the use of a gas, typically a noble gas or a gas mixture, that is ionized to create a plasma field.

**Why the Correct Answer is Right**
Plasma sterilization uses a gas plasma to inactivate microorganisms through the formation of free radicals, which damage the cellular components of microorganisms, ultimately leading to their death. The process is typically carried out at a low temperature, making it suitable for heat-sensitive materials. The gas used in plasma sterilization is usually a noble gas, such as helium or argon, or a gas mixture that is ionized to create the plasma field.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not describe a known method of plasma sterilization.
**Option B:** This option is incorrect as it is a different method of sterilization that uses gamma radiation.
**Option C:** This option is incorrect as it is a different method of sterilization that uses high-pressure steam.

**Clinical Pearl / High-Yield Fact**
Plasma sterilization is a cold sterilization method that is effective against a wide range of microorganisms, including bacteria, viruses, and fungi, making it a suitable option for sterilizing heat-sensitive medical devices.

**Correct Answer:** C. Ethylene oxide