**Core Concept**
Tyndallization is a laboratory technique used to sterilize liquids or heat-sensitive materials by subjecting them to a series of temperature fluctuations, typically involving a combination of boiling and cooling cycles. This process relies on the principle of heat shock and is particularly useful for items that cannot withstand high temperatures.

**Why the Correct Answer is Right**
Tyndallization involves heating the material to a temperature that is sufficient to kill most microorganisms (usually around 100°C), followed by a cooling period to prevent the growth of thermophilic bacteria. This process is repeated for 3 consecutive days to ensure that all microorganisms are eliminated. The heat shock caused by the temperature fluctuations disrupts the cell membranes of microorganisms, ultimately leading to their death.

**Why Each Wrong Option is Incorrect**
**Option A:** Autoclaving - Autoclaving is a different sterilization method that uses high-pressure steam to achieve sterilization, whereas Tyndallization relies on temperature fluctuations.
**Option B:** Pasteurization - Pasteurization is a process used to kill microorganisms by applying heat for a short period, but it is not a series of temperature fluctuations like Tyndallization.
**Option C:** Filtration - Filtration is a method of removing microorganisms from liquids, but it does not involve heat or temperature fluctuations.

**Clinical Pearl / High-Yield Fact**
Tyndallization is often used in laboratories to sterilize items that cannot withstand high temperatures, such as certain types of glassware or equipment. This technique is particularly useful for items that require sterilization but cannot be subjected to the high temperatures required for autoclaving.

**Correct Answer:** C.