**Core Concept**
Sterilization of medical equipment is crucial to prevent the transmission of infectious diseases. Disposable syringes are subjected to various sterilization methods to ensure they are free from microorganisms before use. Ethylene oxide (EtO) is a commonly used sterilizing agent for heat-sensitive medical devices.

**Why the Correct Answer is Right**
Ethylene oxide is a potent alkylating agent that inactivates microorganisms by cross-linking DNA, thereby preventing replication. It is particularly effective against spores, which are highly resistant to other sterilization methods. The use of EtO for sterilizing disposable syringes is widely accepted due to its ability to penetrate packaging materials and reach all surfaces of the device.

**Why Each Wrong Option is Incorrect**
**Option A:** Gamma radiation is not typically used for sterilizing disposable syringes as it can cause degradation of certain materials, such as plastics.
**Option B:** Steam sterilization is effective for metal instruments but is not suitable for disposable syringes as it can cause damage to the plastic components.
**Option C:** Autoclaving is another method of sterilization using high-pressure steam, but it is not used for disposable syringes due to the same reasons as steam sterilization.

**Clinical Pearl / High-Yield Fact**
It's essential to note that not all disposable syringes are sterilized using ethylene oxide. Some may be sterilized using other methods, such as gamma radiation or hydrogen peroxide gas plasma. Always check the manufacturer's instructions for guidance on handling and use.

**Correct Answer: C. Autoclaving is another method of sterilization using high-pressure steam, but it is not used for disposable syringes due to the same reasons as steam sterilization.