**Core Concept**
Heat-labile instruments are sensitive to high temperatures and cannot be sterilized using traditional autoclaving methods. These instruments require alternative sterilization techniques to prevent damage and maintain their functionality.

**Why the Correct Answer is Right**
The correct answer is ethylene oxide sterilization. Ethylene oxide is a gas that effectively kills bacteria, viruses, and other microorganisms at temperatures between 30°C to 50°C, making it ideal for heat-labile instruments. This process involves exposing the instruments to ethylene oxide gas in a sealed chamber, which effectively sterilizes the instruments without causing damage.

**Why Each Wrong Option is Incorrect**
**Option A:** Autoclaving is not suitable for heat-labile instruments as it involves high temperatures and pressures that can cause damage to the instruments. Autoclaving is typically used for instruments that can withstand high temperatures.

**Option B:** Dry heat sterilization is not effective for heat-labile instruments as it requires high temperatures (160°C to 190°C) for an extended period, which can cause damage to the instruments.

**Option C:** Glutaraldehyde is a disinfectant used for non-invasive medical equipment, but it's not suitable for heat-labile instruments as it can cause damage and is not as effective as ethylene oxide sterilization for complete sterilization.

**Clinical Pearl / High-Yield Fact**
Ethylene oxide sterilization is a critical process for heat-labile instruments, and it's essential to follow strict protocols to ensure effective sterilization and prevent damage to the instruments.

**Correct Answer:** C. Glutaraldehyde